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="s0kv0"></dd><ruby id="s0kv0"><xmp id="s0kv0"></xmp></ruby>

單項選擇題

The crank pin journal is provided with large bores for （）.

A.lubrication
B.cooling
C.balancing purpose
D.ventilation

你可能感興趣的試題

單項選擇題

The crank chamber oil （）.

A.can be recovered
B.is only supplied to cylinders
C.only feeds the main bearing
D.is a kind of detergent

單項選擇題

The correct tightening is obtained by use of （） to measure the extension given to the bolts.

A.pressure gauges
B.stretch gauges
C.thermometers
D.bridge gauges