{"id":7511,"date":"2021-12-09T08:30:17","date_gmt":"2021-12-09T00:30:17","guid":{"rendered":"https:\/\/xzfastener.com\/?p=7511"},"modified":"2026-06-24T08:32:01","modified_gmt":"2026-06-24T00:32:01","slug":"anti-loosening-fasteners-for-railway-and-transportation-projects","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/vi\/anti-loosening-fasteners-for-railway-and-transportation-projects\/","title":{"rendered":"Ch\u1ed1t ch\u1ed1ng n\u1edbi l\u1ecfng cho c\u00e1c d\u1ef1 \u00e1n \u0111\u01b0\u1eddng s\u1eaft v\u00e0 giao th\u00f4ng"},"content":{"rendered":"

H\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng s\u1eaft v\u00e0 giao th\u00f4ng v\u1eadn t\u1ea3i ho\u1ea1t \u0111\u1ed9ng trong m\u1ed9t s\u1ed1 \u0111i\u1ec1u ki\u1ec7n t\u1ea3i tr\u1ecdng \u0111\u1ed9ng v\u00e0 rung \u0111\u1ed9ng kh\u1eafc nghi\u1ec7t nh\u1ea5t trong k\u1ef9 thu\u1eadt. M\u1ecdi kh\u1edbp n\u1ed1i \u0111\u1ec1u ph\u1ea3i ch\u1ecbu s\u1ef1 dao \u0111\u1ed9ng li\u00ean t\u1ee5c, t\u1ea3i tr\u1ecdng va \u0111\u1eadp, s\u1ef1 thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9 v\u00e0 chu k\u1ef3 s\u1eed d\u1ee5ng l\u00e2u d\u00e0i. Trong nh\u1eefng m\u00f4i tr\u01b0\u1eddng nh\u01b0 v\u1eady, vi\u1ec7c n\u1edbi l\u1ecfng chi ti\u1ebft si\u1ebft ch\u1eb7t kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ea5n \u0111\u1ec1 nh\u1ecf\u2014n\u00f3 c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn \u0111\u1ed9 an to\u00e0n, \u0111\u1ed9 tin c\u1eady v\u00e0 t\u00ednh li\u00ean t\u1ee5c trong ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n

Do \u0111\u00f3, \u1ed1c v\u00edt ch\u1ed1ng n\u1edbi l\u1ecfng l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng c\u1ee7a k\u1ef9 thu\u1eadt \u0111\u01b0\u1eddng s\u1eaft v\u00e0 v\u1eadn t\u1ea3i. M\u1ee5c \u0111\u00edch c\u1ee7a ch\u00fang kh\u00f4ng ch\u1ec9 l\u00e0 b\u1ea3o \u0111\u1ea3m an to\u00e0n cho c\u00e1c b\u1ed9 ph\u1eadn m\u00e0 c\u00f2n duy tr\u00ec t\u1ea3i tr\u01b0\u1edbc nh\u1ea5t qu\u00e1n trong \u0111i\u1ec1u ki\u1ec7n rung \u0111\u1ed9ng c\u1ef1c \u0111\u1ed9 v\u00e0 l\u1eb7p \u0111i l\u1eb7p l\u1ea1i.<\/p>\n\n\n\n

\u0110\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng bu\u1ed9c ch\u1eb7t c\u00f3 \u0111\u1ed9 b\u1ec1n cao v\u00e0 ch\u1ed1ng rung, ng\u01b0\u1eddi mua c\u00f3 th\u1ec3 xem x\u00e9t XZ Fastener's \u1ed1c v\u00edt c\u01b0\u1eddng \u0111\u1ed9 cao<\/a> v\u00e0 \u1ed1c v\u00edt ti\u00eau chu\u1ea9n<\/a> trang.<\/p>\n\n\n\n

1. T\u1ea1i sao h\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng s\u1eaft y\u00eau c\u1ea7u \u1ed1c v\u00edt ch\u1ed1ng n\u1edbi l\u1ecfng<\/h2>\n\n\n\n

Rung \u0111\u1ed9ng li\u00ean t\u1ee5c l\u00e0 th\u00e1ch th\u1ee9c ch\u00ednh<\/h3>\n\n\n\n

Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c k\u1ebft c\u1ea5u t\u0129nh, h\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng s\u1eaft ch\u1ecbu c\u00e1c l\u1ef1c \u0111\u1ed9ng kh\u00f4ng \u0111\u1ed5i \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi s\u1ef1 t\u01b0\u01a1ng t\u00e1c gi\u1eefa b\u00e1nh xe v\u00e0 \u0111\u01b0\u1eddng ray, phanh, t\u0103ng t\u1ed1c v\u00e0 s\u1ef1 b\u1ea5t th\u01b0\u1eddng c\u1ee7a \u0111\u01b0\u1eddng ray.<\/p>\n\n\n\n

Y\u1ebfu t\u1ed1<\/th>T\u00e1c d\u1ee5ng l\u00ean \u1ed1c v\u00edt<\/th><\/tr><\/thead>
Rung t\u1ea7n s\u1ed1 cao<\/td>M\u1ea5t t\u1ea3i tr\u01b0\u1edbc theo th\u1eddi gian<\/td><\/tr>
T\u1ea3i s\u1ed1c<\/td>C\u0103ng th\u1eb3ng \u0111\u1ed9t ng\u1ed9t l\u00ean \u0111\u1ebfn \u0111\u1ec9nh \u0111i\u1ec3m<\/td><\/tr>
\u0110i xe \u0111\u1ea1p nhi\u1ec7t<\/td>S\u1ef1 m\u1edf r\u1ed9ng v\u00e0 co l\u1ea1i<\/td><\/tr>
Chu k\u1ef3 ph\u1ee5c v\u1ee5 d\u00e0i<\/td>N\u1edbi l\u1ecfng d\u1ea7n d\u1ea7n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

N\u1ebfu kh\u00f4ng c\u00f3 thi\u1ebft k\u1ebf ch\u1ed1ng l\u1ecfng th\u00edch h\u1ee3p, c\u00e1c kh\u1edbp s\u1ebd d\u1ea7n m\u1ea5t \u0111i l\u1ef1c k\u1eb9p v\u00e0 tr\u1edf n\u00ean m\u1ea5t \u1ed5n \u0111\u1ecbnh.<\/p>\n\n\n\n

2. C\u00e1c lo\u1ea1i ch\u1ed1t ch\u1ed1ng l\u1ecfng ch\u00ednh<\/h2>\n\n\n\n

C\u01a1 ch\u1ebf kh\u00e1c nhau cho c\u00e1c m\u1ee9c \u0111\u1ed9 rung kh\u00e1c nhau<\/h3>\n\n\n\n
Lo\u1ea1i gi\u1ea3i ph\u00e1p<\/th>Mechanism<\/th>\u1ee8ng d\u1ee5ng<\/th><\/tr><\/thead>
\u0110ai \u1ed1c m\u00f4-men xo\u1eafn ph\u1ed5 bi\u1ebfn<\/td>Kh\u00e1ng ma s\u00e1t<\/td>C\u00e1c t\u1ed5 h\u1ee3p \u0111\u01b0\u1eddng s\u1eaft n\u00f3i chung<\/td><\/tr>
V\u00f2ng \u0111\u1ec7m kh\u00f3a<\/td>Tay c\u1ea7m \u0111\u00e0n h\u1ed3i ho\u1eb7c c\u01a1 h\u1ecdc<\/td>\u0110\u1ed9 rung nh\u1eb9 \u0111\u1ebfn trung b\u00ecnh<\/td><\/tr>
H\u1ec7 th\u1ed1ng kh\u00f3a n\u00eam<\/td>H\u00e0nh \u0111\u1ed9ng kh\u00f3a c\u01a1<\/td>V\u00f9ng rung \u0111\u1ed9ng cao<\/td><\/tr>
L\u1edbp ph\u1ee7 kh\u00f3a ren<\/td>Li\u00ean k\u1ebft h\u00f3a h\u1ecdc ho\u1eb7c ma s\u00e1t<\/td>OEM th\u00e0nh ph\u1ea7n \u0111\u01b0\u1eddng s\u1eaft<\/td><\/tr>
Bu l\u00f4ng m\u1eb7t b\u00edch c\u00f3 r\u0103ng c\u01b0a<\/td>T\u0103ng c\u01b0\u1eddng \u0111\u1ed9 b\u00e1m b\u1ec1 m\u1eb7t<\/td>K\u1ebft n\u1ed1i \u0111\u01b0\u1eddng s\u1eaft k\u1ebft c\u1ea5u<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

M\u1ed7i h\u1ec7 th\u1ed1ng x\u1eed l\u00fd rung \u0111\u1ed9ng theo m\u1ed9t c\u00e1ch kh\u00e1c nhau v\u00e0 vi\u1ec7c l\u1ef1a ch\u1ecdn t\u00f9y thu\u1ed9c v\u00e0o m\u1ee9c \u0111\u1ed9 nghi\u00eam tr\u1ecdng c\u1ee7a \u1ee9ng d\u1ee5ng.<\/p>\n\n\n\n

3. C\u00e1c \u1ee9ng d\u1ee5ng ch\u00ednh trong \u0111\u01b0\u1eddng s\u1eaft v\u00e0 v\u1eadn t\u1ea3i<\/h2>\n\n\n\n

H\u1ec7 th\u1ed1ng kh\u1edbp quan tr\u1ecdng v\u1ec1 an to\u00e0n<\/h3>\n\n\n\n
Khu v\u1ef1c \u1ee9ng d\u1ee5ng<\/th>L\u00fd do s\u1eed d\u1ee5ng<\/th><\/tr><\/thead>
H\u1ec7 th\u1ed1ng bu\u1ed9c \u0111\u01b0\u1eddng s\u1eaft<\/td>Theo d\u00f5i \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh khi rung<\/td><\/tr>
l\u1eafp r\u00e1p bogie<\/td>T\u1ea3i \u0111\u1ed9ng li\u00ean t\u1ee5c<\/td><\/tr>
H\u1ec7 th\u1ed1ng phanh<\/td>\u1ee8ng su\u1ea5t nhi\u1ec7t v\u00e0 c\u01a1 h\u1ecdc cao<\/td><\/tr>
Th\u00e0nh ph\u1ea7n h\u1ec7 th\u1ed1ng treo<\/td>H\u1ea5p th\u1ee5 s\u1ed1c v\u00e0 an to\u00e0n<\/td><\/tr>
H\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng ray \u0111i\u1ec7n<\/td>Gi\u1ea3m b\u1ea3o tr\u00ec d\u00e0i h\u1ea1n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u0110\u1ed1i v\u1edbi c\u00e1c th\u00e0nh ph\u1ea7n c\u00f3 ren \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng n\u00e0y, ng\u01b0\u1eddi mua c\u0169ng c\u00f3 th\u1ec3 xem l\u1ea1i XZ Fastener thanh ren<\/a> th\u1ec3 lo\u1ea1i.<\/p>\n\n\n\n

4. H\u1ec7 th\u1ed1ng ch\u1ed1ng n\u1edbi l\u1ecfng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n\n\n\n

Duy tr\u00ec t\u1ea3i tr\u01b0\u1edbc l\u00e0 nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i<\/h3>\n\n\n\n

H\u1ea7u h\u1ebft c\u00e1c \u1ed1c v\u00edt ch\u1ed1ng l\u1ecfng kh\u00f4ng ng\u0103n ch\u1eb7n ho\u00e0n to\u00e0n chuy\u1ec3n \u0111\u1ed9ng. Thay v\u00e0o \u0111\u00f3, ch\u00fang duy tr\u00ec t\u1ea3i tr\u01b0\u1edbc ho\u1eb7c ch\u1ed1ng quay khi rung.<\/p>\n\n\n\n

Mechanism<\/th>Function<\/th><\/tr><\/thead>
T\u0103ng ma s\u00e1t<\/td>Gi\u1ea3m chuy\u1ec3n \u0111\u1ed9ng quay<\/td><\/tr>
Kh\u00f3a li\u00ean \u0111\u1ed9ng c\u01a1 kh\u00ed<\/td>Ng\u0103n ch\u1eb7n s\u1ef1 l\u1ecfng l\u1ebbo d\u01b0\u1edbi s\u1ef1 rung \u0111\u1ed9ng<\/td><\/tr>
Bi\u1ebfn d\u1ea1ng \u0111\u00e0n h\u1ed3i<\/td>Duy tr\u00ec l\u1ef1c k\u1eb9p<\/td><\/tr>
Li\u00ean k\u1ebft h\u00f3a h\u1ecdc<\/td>Kh\u00f3a giao di\u1ec7n ch\u1ee7 \u0111\u1ec1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u0110\u1ec3 bi\u1ebft c\u00e1c gi\u1ea3i ph\u00e1p d\u1ef1a tr\u00ean v\u00f2ng \u0111\u1ec7m, h\u00e3y xem XZ Fastener v\u00f2ng \u0111\u1ec7m<\/a> trang.<\/p>\n\n\n\n

5. Nguy\u00ean nh\u00e2n h\u01b0 h\u1ecfng th\u01b0\u1eddng g\u1eb7p \u1edf chi ti\u1ebft si\u1ebft ch\u1eb7t \u0111\u01b0\u1eddng s\u1eaft<\/h2>\n\n\n\n

N\u1edbi l\u1ecfng th\u01b0\u1eddng ti\u1ebfn tri\u1ec3n, kh\u00f4ng \u0111\u1ed9t ng\u1ed9t<\/h3>\n\n\n\n
nguy\u00ean nh\u00e2n<\/th>k\u1ebft qu\u1ea3<\/th><\/tr><\/thead>
T\u1ea3i tr\u01b0\u1edbc kh\u00f4ng \u0111\u1ee7<\/td>N\u1edbi l\u1ecfng kh\u1edbp s\u1edbm<\/td><\/tr>
\u1ee8ng d\u1ee5ng m\u00f4-men xo\u1eafn kh\u00f4ng ch\u00ednh x\u00e1c<\/td>Ph\u00e2n ph\u1ed1i t\u1ea3i kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u<\/td><\/tr>
Ph\u01b0\u01a1ng ph\u00e1p kh\u00f3a sai<\/td>Ch\u1ed1ng rung kh\u00f4ng hi\u1ec7u qu\u1ea3<\/td><\/tr>
\u00d4 nhi\u1ec5m b\u1ec1 m\u1eb7t<\/td>Gi\u1ea3m \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh ma s\u00e1t<\/td><\/tr>
Ch\u1ea5t li\u1ec7u kh\u00f4ng ph\u00f9 h\u1ee3p<\/td>M\u1ec7t m\u1ecfi v\u00e0 m\u1eb7c<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Trong \u0111i\u1ec1u ki\u1ec7n th\u1ef1c t\u1ebf, l\u1ed7i th\u01b0\u1eddng l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a nhi\u1ec1u y\u1ebfu t\u1ed1 ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t l\u1ed7i \u0111\u01a1n l\u1ebb.<\/p>\n\n\n\n

6. C\u00e2n nh\u1eafc v\u1ec1 v\u1eadt li\u1ec7u v\u00e0 l\u1edbp ph\u1ee7<\/h2>\n\n\n\n

Ti\u1ebfp x\u00fac v\u1edbi m\u00f4i tr\u01b0\u1eddng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t<\/h3>\n\n\n\n

H\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng s\u1eaft ho\u1ea1t \u0111\u1ed9ng ngo\u00e0i tr\u1eddi, th\u01b0\u1eddng xuy\u00ean trong \u0111i\u1ec1u ki\u1ec7n th\u1eddi ti\u1ebft kh\u1eafc nghi\u1ec7t. Do \u0111\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n l\u00e0 r\u1ea5t c\u1ea7n thi\u1ebft.<\/p>\n\n\n\n

Ch\u1ea5t li\u1ec7u\/Ho\u00e0n thi\u1ec7n<\/th>L\u1ee3i \u00edch \u1ee9ng d\u1ee5ng<\/th><\/tr><\/thead>
Th\u00e9p carbon c\u00f3 l\u1edbp ph\u1ee7<\/td>S\u1eed d\u1ee5ng k\u1ebft c\u1ea5u chung<\/td><\/tr>
Th\u00e9p kh\u00f4ng g\u1ec9<\/td>Kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n \u1edf nh\u1eefng khu v\u1ef1c ti\u1ebfp x\u00fac<\/td><\/tr>
M\u1ea1 k\u1ebdm<\/td>L\u1edbp b\u1ea3o v\u1ec7 c\u01a1 b\u1ea3n<\/td><\/tr>
M\u1ea1 k\u1ebdm nh\u00fang n\u00f3ng<\/td>B\u1ea3o v\u1ec7 ngo\u00e0i tr\u1eddi h\u1ea1ng n\u1eb7ng<\/td><\/tr>
L\u1edbp ph\u1ee7 v\u1ea3y k\u1ebdm<\/td>Ch\u1ed1ng \u0103n m\u00f2n hi\u1ec7u su\u1ea5t cao<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u0110\u1ed1i v\u1edbi h\u1ec7 th\u1ed1ng s\u01a1n ph\u1ee7, ng\u01b0\u1eddi mua c\u0169ng c\u00f3 th\u1ec3 xem x\u00e9t XZ Fastener's \u1ed1c v\u00edt tr\u00e1ng kh\u00e1c nhau<\/a> v\u00e0 m\u1ea1 k\u1ebdm nh\u00fang n\u00f3ng<\/a> trang.<\/p>\n\n\n\n

7. Nh\u1eefng hi\u1ec3u l\u1ea7m trong ng\u00e0nh<\/h2>\n\n\n\n

Ch\u1ed1ng n\u1edbi l\u1ecfng kh\u00f4ng ph\u1ea3i l\u00e0 gi\u1ea3i ph\u00e1p duy nh\u1ea5t<\/h3>\n\n\n\n
Misunderstanding<\/th>Th\u1ef1c t\u1ebf<\/th><\/tr><\/thead>
V\u00f2ng \u0111\u1ec7m kh\u00f3a gi\u1ea3i quy\u1ebft m\u1ecdi v\u1ea5n \u0111\u1ec1 v\u1ec1 \u0111\u1ed9 rung<\/td>Hi\u1ec7u qu\u1ea3 h\u1ea1n ch\u1ebf \u1edf \u0111\u1ed9 rung cao<\/td><\/tr>
M\u00f4-men xo\u1eafn cao h\u01a1n ng\u0103n ch\u1eb7n s\u1ef1 n\u1edbi l\u1ecfng<\/td>Si\u1ebft qu\u00e1 ch\u1eb7t c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng kh\u1edbp<\/td><\/tr>
M\u1ed9t s\u1ea3n ph\u1ea9m ph\u00f9 h\u1ee3p v\u1edbi t\u1ea5t c\u1ea3 c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng s\u1eaft<\/td>M\u1ed7i \u1ee9ng d\u1ee5ng c\u00f3 y\u00eau c\u1ea7u kh\u00e1c nhau<\/td><\/tr>
Kh\u00f3a ren h\u00f3a h\u1ecdc thay th\u1ebf thi\u1ebft k\u1ebf<\/td>V\u1eabn y\u00eau c\u1ea7u ki\u1ec3m so\u00e1t t\u1ea3i tr\u01b0\u1edbc th\u00edch h\u1ee3p<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 \u0111\u1ed9 b\u1ec1n cao, ng\u01b0\u1eddi mua c\u0169ng c\u00f3 th\u1ec3 xem x\u00e9t XZ Fastener's \u1ed1c v\u00edt c\u01b0\u1eddng \u0111\u1ed9 cao<\/a> trang.<\/p>\n\n\n\n

8. Chi\u1ebfn l\u01b0\u1ee3c tuy\u1ec3n ch\u1ecdn k\u1ef9 s\u01b0<\/h2>\n\n\n\n

B\u1eaft \u0111\u1ea7u t\u1eeb m\u1ee9c \u0111\u1ed9 rung v\u00e0 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng<\/h3>\n\n\n\n
B\u01b0\u1edbc<\/th>h\u00e0nh \u0111\u1ed9ng<\/th><\/tr><\/thead>
1<\/td>X\u00e1c \u0111\u1ecbnh c\u01b0\u1eddng \u0111\u1ed9 rung<\/td><\/tr>
2<\/td>X\u00e1c \u0111\u1ecbnh lo\u1ea1i t\u1ea3i (t\u0129nh, \u0111\u1ed9ng, t\u00e1c \u0111\u1ed9ng)<\/td><\/tr>
3<\/td>Ch\u1ecdn lo\u1ea1i c\u01a1 ch\u1ebf kh\u00f3a<\/td><\/tr>
4<\/td>V\u1eadt li\u1ec7u ph\u00f9 h\u1ee3p v\u00e0 l\u1edbp ph\u1ee7<\/td><\/tr>
5<\/td>X\u00e1c \u0111\u1ecbnh y\u00eau c\u1ea7u m\u00f4-men xo\u1eafn v\u00e0 t\u1ea3i tr\u01b0\u1edbc<\/td><\/tr>
6<\/td>X\u00e1c th\u1ef1c th\u00f4ng qua th\u1eed nghi\u1ec7m ho\u1eb7c m\u00f4 ph\u1ecfng<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

C\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 c\u1ea5u tr\u00fac n\u00e0y gi\u00fap gi\u1ea3m r\u1ee7i ro sai s\u00f3t trong ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1eddng s\u1eaft th\u1ef1c t\u1ebf.<\/p>\n\n\n\n

9. RFQ Danh s\u00e1ch ki\u1ec3m tra d\u00e0nh cho ng\u01b0\u1eddi mua<\/h2>\n\n\n\n

X\u00e1c \u0111\u1ecbnh hi\u1ec7u su\u1ea5t, kh\u00f4ng ch\u1ec9 s\u1ea3n ph\u1ea9m<\/h3>\n\n\n\n

M\u1ed9t b\u1ed9 \u1ed1c v\u00edt ch\u1ed1ng n\u1edbi l\u1ecfng \u0111\u01b0\u1eddng s\u1eaft ho\u00e0n ch\u1ec9nh n\u00ean bao g\u1ed3m: (RFQ)<\/p>\n\n\n\n