航海英語航海學基本知識單項選擇題每日一練(2019.01.24)

來源：考試資料網(wǎng)

1 An orange and white buoy marking a danger area will have what symbol on it?（）

2 A V-shaped ripple with the point of the V pointing upstream in a river may indicate a（）.

3 A vessel is（）when she is not at anchor，made fast to the shore，or aground.

4 A special purpose buoy shall be（）.

5 An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）