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單項(xiàng)選擇題

Waterside scale in a fire-tube boiler may cause （）.

A.increased heat transfer
B.fireside erosion
C.high steam demand
D.overheated tubes

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單項(xiàng)選擇題

The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.

A.gas composition
B.gas temperature
C.pressure
D.timing

單項(xiàng)選擇題

Camshafts are usually driven by timing gears or （）.

A.push rods
B.chain drives
C.rocker arms
D.flywheels

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