（）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.<br>A:A common rail engine；conventional engines<br>B:A conventional engine；common rail engines<br>C:A marine diesel engine；most other engines<br>D:A two-stroke engine；four-stroke engines

（）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

出自：海船船员证

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