用于作为真向或磁向的基准。（）<br>A:It is used as a reference to either true nor magnetic direction.<br>B:It is used as a reference to either true or magnetic direction.<br>C:It is used as a reference to neither true or magnetic direction.<br>D:It is used as a reference to neither true nor magnetic direction.

用于作为真向或磁向的基准。（）
A:It is used as a reference to either true nor magnetic direction.
B:It is used as a reference to either true or magnetic direction.
C:It is used as a reference to neither true or magnetic direction.
D:It is used as a reference to neither true nor magnetic direction.

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