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

<acronym id="xcer9"></acronym>

<acronym id="xcer9"><address id="xcer9"><rp id="xcer9"></rp></address></acronym><acronym id="xcer9"><table id="xcer9"></table></acronym>

單項(xiàng)選擇題

Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.

A.overheated compressor bearings
B.excess lube oil viscosity
C.carbon deposits on the compressor piston rings
D.wax crystals forming in the lubricant

你可能感興趣的試題

單項(xiàng)選擇題

The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）.

A.electric motor
B.volute
C.impeller
D.diffusion nozzle

單項(xiàng)選擇題

In a refrigeration system, foaming of the crankcase oil may cause the （）.

A.expansion valve to overfeed
B.compressor to knock
C.water regulating valve to fail
D.crankcase drains to plug