航海英語號燈與號型單項選擇題每日一練(2019.01.19)

來源：考試資料網(wǎng)

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

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2 A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.

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3 Daymarks marking the starboard side of the channel when going towards the sea are（）.

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4 A flashing light is a light that（）.

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5 Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）

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