单项选择题
The water in an auxiliary boiler should be tested daily for （）.
A.dissolved oxygen
B.chlorides
C.sludge
D.dissolved nitrogen
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相关考题
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单项选择题
A feed pump for an auxiliary boiler might lose suction if the （）.
A.boiler water level is low
B.feedwater is too hot
C.boiler steam demand is low
D.feedwater is too cold -
单项选择题
Fuel is admitted to a diesel engine cylinder through the （）.
A.intake valves
B.carburetor
C.exhaust ports
D.injector nozzles -
单项选择题
Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.
A.clearance
B.crush
C.pitch
D.thrust
