单项选择题

In a common rail engine, the fuel is injected into cylinders（）

A.by injection pumps
B.at a time decided by the injection pump timing
C.by a signal opening the magnetic valves
D.at a time decided by the cam directly

相关考题

In common rail engines, the fuel is（） before is injecte...

单项选择题In common rail engines, the fuel is（） before is injected into the cylinders.

A.stored in a common fuel line
B.pumped by the injection pump
C.at low pressure
D.already atomized

In conventional systems, the injection pressure（）, whil...

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

The difference between Fixed pitch propeller (FPP) and ...

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

船舶电气与船舶安全

In a common rail engine, the fuel is injected into cylinders（）