题目内容

卸扣使用应注意() ①不许超负荷作业; ②不可横向受力; ③带螺纹的横栓不得碰损; ④卸扣不用时横销要上油以保持润滑。

A. ①②③④;
B. ①③④;
C. ②③④;
D. ①②③。

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A. Enter the keyword AUT
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