单项选择题
A. Full ahead! B. Slow astern! C. Half astern! D. Ahead three!
A. Bow stern full to port! B. Bow stern half to port! C. Stern thrust half to starboard ! D. Stern thrust full to port!
A. Bow stern full to port! B. Bow stern half to port! C. Stern thrust half to starboard ! D. Bow thrust full to port!