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
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
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．
- 我要回答: 网友(216.73.216.96)
- 热门题目: 1.对于不可修产品的平均寿命，是 2.（）是与产品的可靠性和维修性 3.λ（t）称为（）。