题目内容

The dog always outside.

A. run
B. runs
C. running
D. do run

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Thenominaldiameterofaboltisrepresentedby"d",andthediameteroftheholesonthetwopartssupposedtobejoinedisrepresentedby"d0",thenwhichoneiscorrect?螺栓的公称直径用d表示,两个薄的连接件上的通孔直径用d0表示,两个直径关系正确的是:

A. d=d0
B. d>d0
C. d

螺栓连接中,共有标准件()件。

A. 2
B. 3
C. 4
D. 5

In the stud joint, the screw end should be completely screwed into the threaded hole of thick parts.双头螺柱的连接中,旋入端要完全旋入厚零件的螺纹孔。

A. 对
B. 错

The taper angle at the bottom of the threaded hole should be 90 degrees when drawing. 螺纹孔底部的锥角,绘图时应该画成90度

A. 对
B. 错

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