单项选择题
----How answers? -----（）(舵很灵) ！
A. No steerage
B. Answers back
C. Answers all right
D. No answer
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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).
A. compass
B. direction finder
C. loran
D. sextant -
单项选择题
Officers use sextants to observe （）.
A. stars
B. celestial bodies
C. the sun
D. the moon
