A.the distance between them remains the same
B.the distance between them is changing
C.the position between them is not changing
D.their positions to the earth remain the same
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A.the period of time during which no trouble occurs to the engine
B.no trouble will occur to the engine all its life
C.trouble may occur freely to the engine
D.no matter what you do to the engine, no trouble will occur during this period
A.after the point is reached at which the failures begin to increase rapidly
B.before the point is reached at which the failures begin to increase rapidly
C.before the point is reached at which the failures begin to increase slowly
D.after the point is reached at which the failures begin to increase slowly
A.no equipment in contact with sea water
B.less equipment in contact with fresh water
C.more equipment in contact with sea water
D.less equipment in contact with sea water
A.the temperature
B.the rust
C.the pressure
D.the humidity
A.pumped speed；came out
B.pumping rate；overflowed
C.flowing rate；leaked out
D.flowed speed；spilled out
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In using reduction gears to obtain efficient propeller speeds, （）.
Maximum horsepower of a diesel engine is attained （）.
For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.
A thrust bearing is used with a propulsion diesel engine to （）.
When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）
A diesel engine piston ring face is in direct contact with the （）.
The function of diesel engine piston compression rings is to （）.
To determine if the lube oil filter elements need changing, （）.
Control of the main propulsion diesel engines can be shifted from the engine room to the wheelhouse from the （）.
Proper filtering and straining of fuel oil is important because the （）.