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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

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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