Which of the following item is the cause to the damage of parts and excess wearing?（）

单项选择题The main purpose of inspection for a running diesel engine is（）

A.testing for the mechanical load and the thermal load
B.inspecting thermal and mechanical condition of the engine
C.inspecting each system and exhaust temperature
D.testing for compress pressure and explosion pressure

单项选择题During the diesel engine running, the water level of FW expansion tank should normally kept in the （） level of glass tube.

A.the highest
B.above 3/4
C.1/2-3/4
D.the lowest

单项选择题The normal color of the exhaust gas of the diesel will be （）

A.achromatism or thin gray
B.thin white
C.sky-blue
D.black

单项选择题During the running of the diesel engine, if the supply of cooling water is interrupted or the temperature of cooling water out of the cylinder is too high, the duty engineer should （）

A.notify the duty officer, reduce the engine speed, take some measures to remove failures
B.notify the duty officer and stop the engine immediately, find the cause and remove failures
C.notify the C/E
D.notify the captain

单项选择题If the main engine starting consecutively failed （） times, it should be found the cause before another starting.

A.2
B.3
C.4
D.5