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

單項(xiàng)選擇題

A non-return valve in the air delivery line near to the compressor must be （）type similar to the compressor discharge valve.

A.the low inertia
B.the high inertia
C.the low velocity
D.the high velocity

你可能感興趣的試題

單項(xiàng)選擇題

A （） in the air delivery line near to each compressor is essential.

A.butterfly valve
B.globe valve
C.gate valve
D.non-return valve

單項(xiàng)選擇題

Adequate attention must be given to the water cooling system of the air compressors, for （） can cause condensation on the cylinder walls.

A.overcooling
B.poor cooling
C.overloading
D.unloading