单选题
1分
It is important to note that the injection only take place when the plunger is moving up the ______ ...
It is important to note that the injection only take place when the plunger is moving up the ______ of cams.
参考答案: B
参考解析: 注:重要的是要记住,只有当柱塞沿着凸轮斜面向上运动时才开始喷油。