單項(xiàng)選擇題

Dirt should not be allowed to contaminate a grease lubricant because the （）.

A.dirt will cause corrosion of bearing
B.bearings will leak oil excessively
C.dirt is very abrasive when mixed with grease
D.grease will become inflammable

你可能感興趣的試題

單項(xiàng)選擇題

The presence of bubbles in a refrigeration system liquid line may （）.

A.promote refrigerant dehydration
B.be absorbed in the receiver
C.cause low condensing pressure
D.carry moisture and lead to corrosion

單項(xiàng)選擇題

Air entering an air-cooled refrigeration system is indicated by （）.

A.frosting of the liquid line
B.higher than normal head pressure
C.a clear sight glass
D.abnormally cold reefer boxes

97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区 狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

Dirt should not be allowed to contaminate a grease lubricant because the （）.

你可能感興趣的試題

The presence of bubbles in a refrigeration system liquid line may （）.

Air entering an air-cooled refrigeration system is indicated by （）.

97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久