【单选题】
互换装配法必须保证各有关零件公差值平方之和的平方根___ 装配公差。
A. 大于
B. 小于
C. 小于或等于
D. 大于或等于
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答案
C
解析
暂无解析
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引蒸汽的时候，由于高温蒸汽与管道中的冷凝水接触，冷凝水升温，发生___，体积迅速膨胀，出现“汽锤”，使管道猛烈抖动，称为“水击”。
A. 化学反应
B. 相变
C. 爆炸
D. 冷凝
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