单项选择题
A. No steerage B. Answers back C. Answers all right D. No answer
How answers? -----（）(舵反转) ！A. No steerageB. Answers...
单项选择题How answers? -----（）(舵反转) ！
This is a （）(罗兰).A. compassB. direction finderC. loranD...
单项选择题This is a （）(罗兰).
A. compass B. direction finder C. loran D. sextant
Officers use sextants to observe （）.A. starsB. celestia...
单项选择题Officers use sextants to observe （）.
A. stars B. celestial bodies C. the sun D. the moon
