试题与答案

管子对口时，其厚度差不得超过公称厚度的（），但最大不得超过3mm。A、15% B、2

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题型：单项选择题

题目：

管子对口时，其厚度差不得超过公称厚度的（），但最大不得超过3mm。

A、15%

B、20%

C、25%

D、30%

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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