航海英语航海图书资料单项选择题每日一练(2018.11.19)

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1 A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.

2 The distance between the surface of the water and the tidal datum is the （）.

3 You will find information about the duration of slack water in the （）.

4 （）objects are those which stand out clearly from the background or other objects and are easily identifiable from a few miles offshore in normal visibility．

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5 The Daily Memorandum contains information on（）.

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