试题与答案

擦法操作时使用介质作用是() A.增大擦动幅度 B.加快操作速度 C.防止擦

题型:单项选择题

题目:

擦法操作时使用介质作用是()

A.增大擦动幅度

B.加快操作速度

C.防止擦破皮肤

D.增加摩擦阻力

E.以上都是

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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