97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

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