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

<ruby id="xb9um"><small id="xb9um"></small></ruby>

<ins id="xb9um"><tt id="xb9um"></tt></ins>

<sup id="xb9um"><pre id="xb9um"><div id="xb9um"></div></pre></sup><pre id="xb9um"><strong id="xb9um"></strong></pre>

單項(xiàng)選擇題

Diesel engines obtain combustion air through turbo chargers，blowers，or（）.

A.air starters
B.carburetors
C.natural aspiration
D.air receivers

你可能感興趣的試題

單項(xiàng)選擇題

Diesel engines are considered safer than gasoline engines because（）.

A.they are more heavily built
B.the fuel used is less volatile
C.they can be easily reversed
D.they operate at a lower speed

單項(xiàng)選擇題

Before starting any diesel or gasoline engine，which of the following must be checked? （）

A.Oil level
B.Flow of cooling water
C.Exhaust discharge
D.All of the above