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單項(xiàng)選擇題

A charge of fresh air is drawn into the engine cylinder and then （） by the moving piston（） very high pressure.

A.pressed；to
B.pressurized；with
C.pushed；in
D.compressed；to

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單項(xiàng)選擇題

A cast steel strong back is fitted in way of the combustion space to help absorb （）.

A.flame temperature
B.fuel oil
C.air movement
D.gas forces

單項(xiàng)選擇題

（） clearances in the main or crank pin bearings will sometimes be indicated by loss of pressure in the lubricating system before any bearing knock is heard.

A.Too larger
B.Too smaller
C.Excess
D.Excessive

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