航海英語船舶設(shè)備名稱單項(xiàng)選擇題每日一練(2019.01.14)

來源：考試資料網(wǎng)

1 Limit switches are used on which davits?（）

2 A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a（）.

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3 In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.

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4 A term applied to the bottom shell plating in a double-bottom ship is（）.

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5 The boat is stowed on the davit rather than on a cradle with which type of davit?（）

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