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單項選擇題

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

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單項選擇題

（） 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

單項選擇題

（） supplies pilot air to control the cylinder air start valves.

A.An air compressor
B.An indicator cock
C.An air distributor
D.A safety valve

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