单项选择题
A.dissolved oxygen B.chlorides C.sludge D.dissolved nitrogen
A feed pump for an auxiliary boiler might lose suction ...
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
Fuel is admitted to a diesel engine cylinder through th...
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
Diesel engine main and connecting rod precision bearing...
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
