The two-stroke cycle begins with the piston coming up from the BDC, with the scavenging ports in the sides of the cylinders being （）.<br>A:open<br>B:uncover<br>C:covered<br>D:closed

The two-stroke cycle begins with the piston coming up from the BDC, with the scavenging ports in the sides of the cylinders being （）.
A:open
B:uncover
C:covered
D:closed

出自：海船船员证

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