题目内容

印刷机的自动清洁装置主要用于清除网板孔中的残留焊膏,保证印刷质量。

A. 对
B. 错

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目前对印制精度的要求是根据印制板组装密度和元器件引脚间距的最小尺寸决定,一般要求达到±0.025 mm

A. 对
B. 错

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什么叫做气缚?如何避免?

I think you need the dictionary , it can help you study easily.

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