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(2019.01.14)

來源：考試資料網(wǎng)

1 The total magnetic effects which cause deviation of a vessel’s compass can be broken down into a series of components which are referred to as（）.

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

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3 Variation in a compass is caused by（）.

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4 Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.

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5 In more recent years，（）has been used by civilians in many new ways to determine positions，such as in automobile and boat navigation，hiking，emergency rescue，and precision agriculture and mining.

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