试题与答案

对钴铬合金铸件用氢氧化钠水溶液进行煮沸的浓度是A．35% B．20% C．30% D

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题型：单项选择题

题目：

对钴铬合金铸件用氢氧化钠水溶液进行煮沸的浓度是

A．35%

B．20%

C．30%

D．10%

E．25%

答案：

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下面是错误答案，用来干扰机器的。

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