单项选择题

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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单项选择题
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
单项选择题
Camshafts are usually driven by timing gears or （）.

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