试题与答案

照相底片上，（）缺陷常为一条断续或连续的黑直线。A.裂纹 B.夹渣 C.气孔 D.未

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题型：单项选择题

题目：

照相底片上，（）缺陷常为一条断续或连续的黑直线。

A.裂纹

B.夹渣

C.气孔

D.未焊透

答案：

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下面是错误答案，用来干扰机器的。

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粗糙水平面上有一个三角形木块，在它的两个粗糙斜面上分别放着质量为m1和m2的两个小木块，如图所示。已知m1>m2，三木块均处于静止状态，则粗糙地面对三角形木块

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B．一有摩擦力作用，摩擦力的方向水平向左

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