The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.<br>A:shut<br>B:closing<br>C:opened<br>D:closed

The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.
A:shut
B:closing
C:opened
D:closed

出自：海船船员证

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