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

單項(xiàng)選擇題

Bearing knocks are likely to occur from （）.

A.less clearance
B.dirty lube oil
C.overload
D.bearing wear

你可能感興趣的試題

單項(xiàng)選擇題

Be sure to make the engine turn by （） before starting and after stopping .

A.steering gear
B.turning gear
C.steering wheel
D.turning cycle

單項(xiàng)選擇題

At the top of the A-frames there is a strong cast iron frame called （）.

A.cylinder liner
B.cylinder cover
C.the gear box
D.the scavenging box