"fastener is a mechanical device that is used to tie two object

  • 2024-01-18 10:41:27
  • 单词
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"fastener is a mechanical device that is used to tie two objects together. such as a bolt,nail,rivet or screw " Which of the following doesn't belong to “紧固件” ?

A.螺栓

B.铆钉

C.螺钉

D.交换器

正确答案是D