航海英語船舶設(shè)備名稱單項選擇題每日一練(2019.01.20)

來源：考試資料網(wǎng)

1 The purpose of a bilge well is to（）.

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

3 Permission is kindly requested（）the ballast water.

4 A sextant having an index error that is off the arc has a（）.

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