无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

<progress id="ndkws"></progress>

<ins id="ndkws"></ins>

單項(xiàng)選擇題

If the engine does start on air, but combustion does not immediately begin, the cause may be （）.

A.failure of the fuel pumps
B.starting air pressure too low
C.stop valve in air line closed
D.the turning gear still engaged

你可能感興趣的試題

單項(xiàng)選擇題

If the engine does not start on air, it may be due to （）

A.low compression of the fuel pumps
B.incorrect timing of fuel pumps
C.the starting air valves stuck
D.air-locks in fuel oil pipeline

單項(xiàng)選擇題

If the engine （） for a long period, there will be a danger of frost.

A.must to stand inoperative
B.has to stand inoperative
C.must be stood idle
D.will stand idle

<pre id="0knjq"><legend id="0knjq"><div id="0knjq"></div></legend></pre>

<ruby id="0knjq"><small id="0knjq"></small></ruby>

<pre id="0knjq"><legend id="0knjq"></legend></pre>