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單項(xiàng)選擇題

Operating conditions in the crank chamber are very （） those in the cylinder.

A.the same as
B.similar to
C.separated from
D.different from

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單項(xiàng)選擇題

Opening of the cylinder （） will admit compressed air into the cylinder.

A.safety valve
B.indicator cock
C.blow-down valve
D.start valve

單項(xiàng)選擇題

Once all cylinders are firing regularly, （） is shut off.

A.the exhaust valve
B.the starting air
C.the inlet valve
D.the fuel oil

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