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

<ruby id="lhp4h"><xmp id="lhp4h"></xmp></ruby>

<dl id="lhp4h"></dl><dd id="lhp4h"></dd>

<ruby id="lhp4h"><xmp id="lhp4h"></xmp></ruby>

<ruby id="lhp4h"><xmp id="lhp4h"></xmp></ruby>

<ruby id="lhp4h"><xmp id="lhp4h"></xmp></ruby>

單項(xiàng)選擇題

A feed pump for an auxiliary boiler might lose suction if the （）.

A.boiler water level is low
B.feedwater is too hot
C.boiler steam demand is low
D.feedwater is too cold

你可能感興趣的試題

單項(xiàng)選擇題

Fuel is admitted to a diesel engine cylinder through the （）.

A.intake valves
B.carburetor
C.exhaust ports
D.injector nozzles

單項(xiàng)選擇題

Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.

A.clearance
B.crush
C.pitch
D.thrust

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

<ruby id="iaeoj"><xmp id="iaeoj"></xmp></ruby>