单项选择题
With regards to a diesel engine crankcase explosion, the most violent is the（） (1) primary explosion (2) secondary explosion
A.(1) only B.(2) only C.both (1) and (2) D.neither (1) or (2)
Waterside scale in a fire-tube boiler may cause （）.A.in...
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
The maximum pressure developed by a waste heat boiler i...
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
Camshafts are usually driven by timing gears or （）.A.pu...
单项选择题Camshafts are usually driven by timing gears or （）.
A.push rods B.chain drives C.rocker arms D.flywheels
