单项选择题

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（）.

A.divisional parts
B.coefficients
C.fractional parts
D.equations

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磁罗经与陀螺罗经的使用

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（）.