液压元件不要轻易拆卸,如必须拆卸时,应将清洗后的零件放在干净地方。在重新装配时要防止金属屑、棉纱等杂物进入元件内。
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油液粘度因温度升高而减小,因压力增大而增大。
A. 对
B. 错
适用于含纤维、微小固体颗料等介质的阀是()。A.B. C. D.
A. 蝶阀
B. 旋塞阀
C. 球阀
D. 节流阀
阀门Z944T-1,DN500代表的连接方式是( )。
A. 法兰连接
B. 焊接连接
C. 热熔连接
D. 螺纹连接
What is advertising?Advertising is a means of _________ with the users of a product or service.Advertisements are messages paid for by those who send them and are intended to ______ or ________ people who receive them.