單項選擇題（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.

A.A common rail engine；conventional engines
B.A conventional engine；common rail engines
C.A marine diesel engine；most other engines
D.A two-stroke engine；four-stroke engines


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1.單項選擇題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

2.單項選擇題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