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

<thead id="aw2bv"><cite id="aw2bv"></cite></thead>

<pre id="aw2bv"><strong id="aw2bv"></strong></pre>

單項選擇題

During working of an air compressor, （） should be drained.

A.oil sump
B.oil separator
C.outlet pipe
D.inlet pipe

你可能感興趣的試題

單項選擇題

During working of an air compressor, （） should be drained.

A.inter cooler
B.cylinder
C.outlet pipe
D.inlet pipe

單項選擇題

Before starting an air compressor, It should be （）.

A.unloaded
B.primed
C.filled with water
D.greased