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水准测量由往测转为返测时，前后两根水准标尺必须互换位置，但仪器无需重新安置。

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水准测量由往测转为返测时，前后两根水准标尺必须互换位置，但仪器无需重新安置。

A.正确

B.错误

参考答案:

答案：错误

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