问题
单项选择题
The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.
A.variation
B.compass error
C.deviation
D.earth's magnetic force
答案
参考答案：C
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The principal purpose of adjustment of the magnetic compass is to eliminate（）as far as possible.
A.variation
B.compass error
C.deviation
D.earth's magnetic force
参考答案：C