题目内容

采用刚性固定法后,焊件就不会产生残余变形了。

A. 正确
B. 错误

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简述鸣凤之死。

填料密封在安装时要注意什么?

塔吊的工作机构由()组成。

Safe speed is defined as that speed where().

A. you can stop within your visibility range
B. the vessel is not subject to vibrations
C. you are traveling slower than surrounding vessels
D. you can take proper and effective action to avoid collisio

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