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="yb9e7"><output id="yb9e7"></output></ruby>

單項(xiàng)選擇題

In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.

A.inefficiency
B.oiliness
C.detergency
D.purity

你可能感興趣的試題

單項(xiàng)選擇題

In general, （） is suitable for delivering small quantities at high pressure.

A.reciprocating pump
B.gear pump
C.centrifugal pump
D.vane pump

單項(xiàng)選擇題

In four strokes engine, the cycle of events is completed in four strokes of （）.

A.the cylinder
B.the crankshaft
C.the piston
D.the cross-head

<blockquote id="viqzm"><acronym id="viqzm"></acronym></blockquote>