航海英語(yǔ)單項(xiàng)選擇題每日一練(2019.12.16)

來(lái)源：考試資料網(wǎng)

1 Initial stability of a vessel may be improved by（）.

2 A special daymark is a（）.

3 A cable used by helicopters for lifting or lowering persons in a pick-up operation is a（）.

4 That center around which a vessel trims is called the（）.

5 A wooden plug fitted tightly in the vent of a damaged tank may prevent the tank from（）.