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问题

The needle valve in a fuel valve will _____ when the fuel pressure action on the needle va


The needle valve in a fuel valve will _____ when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.

A.be jammed

B.be opened

C.be seated

D.be broken

请帮忙给出正确答案和分析,谢谢!

参考答案
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