A.well
B.good
C.excellent
D.respectively
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A.lime
B.frost
C.scale
D.scar
A.scar
B.scale
C.spur
D.bilge
A.continuously
B.regularly
C.constantly
D.period
A.to change the lube oil
B.have the lube oil purified
C.have the lube oil burnt
D.to analyze the lube oil
A.not less than twice
B.greater at least twice than
C.not greater twice than
D.larger three times than
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If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.
Maximum horsepower of a diesel engine is attained （）.
The ability of the governor to prevent fluctuations in engine speed is termed （）.
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In using reduction gears to obtain efficient propeller speeds, （）.
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The highest pressure in a diesel engine cylinder normally occurs （）.
In a simple mechanical governor, the （）.
Diesel engine control can be obtained by the bridge （）.
Combustion knock occurring in a diesel engine can be caused by （）.