航海英語磁羅經(jīng)與陀螺羅經(jīng)的使用單項選擇題每日一練(2019.01.20)

來源：考試資料網(wǎng)

1 The error in a magnetic compass caused by the vessel’s magnetism is called（）.

2 What is the basic principle of the magnetic compass（）.

3 The vertical angle between the horizontal and the magnetic line of force is the（）.

4 The magnetic compass operates on the principle that（）.

5 To center a compass bowl in its binnacle，you should have the ship on an even keel，heading north or south，and adjust the screws until（）.