明代永乐年间（1403―1424），泰和（）任翰林编修、《永乐大典》总裁。
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When navigating in thick fog with the radar on，you should（）.
A. station the look-out in the wheelhouse to keep a continuous watch on the radar
B. secure the sounding of fog signals until a vessel closes within five miles
C. station a look-out as low down and far forward as possible
D. keep the radar on the shortest available range for early detection of approaching vessel
普通螺纹的符号D代表外螺纹大径。
A. 正确
B. 错误
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