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

The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.

A.the beginning of the compression stroke
B.the beginning of the suction stroke
C.the end of the working stroke
D.the end of the exhaust stroke

你可能感興趣的試題

單項(xiàng)選擇題

The cylinder and piston must be warmed up （） to a temperature of about 140 degF in standing by engine.

A.repeatedly
B.quickly
C.gradually
D.immediately

單項(xiàng)選擇題

The crown is fairly thick with the cylindrical parts （） to a thinner section.

A.forged
B.tapering
C.drilling
D.boring