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单选题
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
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更多 “单选题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 goingB the inlet valve is opened by the down going piston；the inlet valve is closedC the inlet port is opened by the down going piston；the port is closed by the up comingD the inlet valve is opened” 相关考题
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