When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.<br>A:just<br>B:nearly<br>C:merely<br>D:already

When the starting air valve closes on one cylinder, another starting air valve has （） opened on another cylinder whose piston has just commenced its downward stroke.
A:just
B:nearly
C:merely
D:already

出自：海船船员证

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