A. Sailors are always on watch on the bridge. B. Deck officers are always on watch on the bridge. C. Sailors are never on watch on the bridge. D. Deck officers are never on watch on the bridge.
A.前进三! B.后退二! C.后退一! D.中速后退!
A. on watch B. taking watches C. standing watches D. keep watches
A.port B.middle C.head D.front