It is important to note that the injection only takes place when the plunger is moving up the cam （）.<br>A:base circle<br>B:slope<br>C:bottom point<br>D:top point

It is important to note that the injection only takes place when the plunger is moving up the cam （）.
A:base circle
B:slope
C:bottom point
D:top point

出自：海船船员证

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