航海英語號燈與號型單項(xiàng)選擇題每日一練(2019.01.14)

來源：考試資料網(wǎng)

1 A power-driven vessel，when towing astern，shall show（）.

2 The duration of a prolonged blast of the whistle is（）.

3 An occulting light is one in which（）.

4 All fog signals shall be sounded every two minutes with the exception of a vessel（）.

5 A flashing light is a light that（）.

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