单项选择题
How answers? -----（）(舵反转) ！
A. No steerage B. Answers back C. Answers all right D. No answer
单项选择题 This is a （）(罗兰).
单项选择题 Officers use sextants to observe （）.
单项选择题 The telegraph is the（）(设备)that connects the engine room and the bridge.
