航海英語(yǔ)航海圖書資料單項(xiàng)選擇題每日一練(2018.11.19)

來(lái)源：考試資料網(wǎng)

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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