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问题

As the plunger moves up, the ports are closed and the fuel _____ and delivered to the inje


As the plunger moves up, the ports are closed and the fuel _____ and delivered to the injector nozzle at very high pressure.

A.being compressed

B.to be pumped up

C.is pressurized

D.are built up

请帮忙给出正确答案和分析,谢谢!

参考答案
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