航海英語磁羅經(jīng)與陀螺羅經(jīng)的使用單項(xiàng)選擇題每日一練(2019.01.19)

來源：考試資料網(wǎng)

1 This induced magnetism（）the permanent magnetism already present in the ship.

2 The principal purpose of magnetic compass adjustment is to（）.

3 The compass error of a magnetic compass that has no deviation is（）.

4 The Flinders bar on a magnetic compass compensates for the（）.

5 The compass heading of a vessel differs from the true heading by（）.