航海英語船舶設(shè)備名稱單項(xiàng)選擇題每日一練(2019.01.17)

來源：考試資料網(wǎng)

1 The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.

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2 If a gasoline engine turns over freely but will not start，the cause is generally（）.

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3 The exhaust pipe must be gas tight throughout its entire length otherwise（）.

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4 The most common type of davit found on merchant vessels today is the（）.

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5 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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