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

<dd id="bpolg"><strong id="bpolg"></strong></dd>

單項選擇題

A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.

A.cylinder heads
B.exhaust valves
C.scavenging air
D.injectors

你可能感興趣的試題

單項選擇題

Lube oil pumps taking suction from the sump of most small marine engines are usually （）.

A.of the diaphragm type
B.of the centrifugal type
C.of the positive displacement type
D.independently driven by electric motors

單項選擇題

Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.

A.intake stroke
B.exhaust stroke
C.power stroke
D.compression stroke

<pre id="ubfa7"><acronym id="ubfa7"></acronym></pre>