单项选择题
A.concentrations of calcium sulfate in the boiler water B.fuel oil in the feed water C.improper treatment of the feed water with calcium sulfate D.excessive feed water alkalinity
For proper operation, auxiliary boiler feed water must ...
单项选择题For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）
A.High oxygen concentration B.Low pH C.Proper alkalinity D.All of the above
If a four-stroke/cycle diesel engine is running at 1550...
单项选择题If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.
A.525 RPM B.775 RPM C.1550 RPM D.1800 RPM
An indication of a diesel engine air intake being parti...
单项选择题An indication of a diesel engine air intake being partially clogged, is （）.
A.low firing pressure and low exhaust temperatures B.low firing pressure and normal exhaust temperatures C.high firing pressure and low exhaust temperatures D.high firing pressure and high exhaust temperatures
