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.
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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