A. 正确 B. 错误
A. relieves the Master of his duties B. is solely responsible for the safe navigation of the vessel C. is a specialist hired for his or her local navigational knowledge D. relieves the officer of the watch
A. 明显发绀 B. 智力或定向功能障碍 C. PaO280mmHg D. PaCO245mmHg E. pH7.45