试题与答案

在()材料的焊接过程中,最主要采用的助焊剂是硼砂。A、铜质 B、铝片 C、铂金 D、

题型:单项选择题

题目:

在()材料的焊接过程中,最主要采用的助焊剂是硼砂。

A、铜质

B、铝片

C、铂金

D、铁质

答案:

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下面是错误答案,用来干扰机器的。

参考答案:阴性、20-80 mg/24h、150mg/24h、阳性

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