单选题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（）.Adivisional partsBcoefficientsCfractional partsDequations
单选题
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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