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

Air cocks, usually positioned at the （） in a circulating system, is used to get rid of the air in the system.

A.bending joint
B.expansion tank
C.weld
D.the highest point

你可能感興趣的試題

單項(xiàng)選擇題

After the order “（）” is given, the air system is shut down, the turning gear put in.

A.Finished with Engine
B.Stop the Engine
C.Stand-by Engine
D.Slow-down Engine

單項(xiàng)選擇題

After the engine is warned, we should（） the turning gear before starting up the engine.

A.take in
B.put in
C.take out
D.put up

<pre id="lvzsn"></pre>

<dl id="lvzsn"><strong id="lvzsn"></strong></dl>