问题描述：
[单选]
The needle valve will open when the fuel pressure acting on the needle valve（）exerts a sufficient force to overcome the spring compression．
A．tape face
B．tapered face
C．surface
D．thinner face
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答案解析：无
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上一篇：The oil is drawn from a drain tank through（）， one of a pair of pumps， into one of fine filters．
下一篇：The needle valve in the injector（）at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder．
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