In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）<br>A:the inlet port is opened by the up coming piston； the port is closed by the down going<br>B:the inlet valve is opened by the down going piston；the inlet valve is closed<br>C:the inlet port is opened by the down going piston；the port is closed by the up coming<br>D:the inlet valve is opened

In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）
A:the inlet port is opened by the up coming piston； the port is closed by the down going
B:the inlet valve is opened by the down going piston；the inlet valve is closed
C:the inlet port is opened by the down going piston；the port is closed by the up coming
D:the inlet valve is opened

出自：海船船员证

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