常用接触角的大小来表示液体对固体的润湿性。接触角越______,润湿性越好。
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喷粉处理时,引射气流量下降、压力增高说明()。
A. 喷枪熔断
B. 喷枪堵塞
C. 喷粉罐喉口堵塞
喷粉处理采用()气力输送粉剂。
A. 柱塞流
B. 脉冲波
C. 悬浮流
A restorative material that has a high proportional limit,compared with one with a lower proportional limit,invariably has()
A. greater ductility
B. greater toughness
C. a higher modulus ofelasticity
D. more resistance to permanent deformation