单项选择题
In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.
A.fluctuates with the engine speed to some extent, independent of the engine speed
B.keeps constant at all engine speed, dependent on the engine speed to some extent
C.keeps constant at all engine speed, independent of the engine speed
D.is decided by the engine speed, constant at all engine speed
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相关考题
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单项选择题
The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that（）
A.for FP, once fitted, the position of the blades can also be changed in operation
B.for CP, once fitted, the position of the blades can also be changed in operation
C.the CP type has a relatively smaller hub compared with the FP propellers
D.the FP type has a relatively larger hub compared with the CP propellers -
单项选择题
The propeller consists of a （）with several blades of helicoidal form attached to it.
A.shaft
B.boss
C.wheel
D.lever -
单项选择题
Oil pressure in the lubrication system is（）than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.
A.higher
B.lower
C.very higher
D.very lower
