航海英語船舶設(shè)備名稱單項(xiàng)選擇題每日一練(2019.01.18)

來源：考試資料網(wǎng)

1 The portable radio apparatus means（）.

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2 As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.

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3 An example of a modern anchor which has a stock is a(n)（）.

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4 In relation to cargo gear，what does SWL mean?（）.

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5 A strong back refers to a（）.

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