多选题在啊种情况下Site Master需要进行校准（）A每次使用之前B第一次使用时C当环境和温度改变时D当测量频率范围改变时
多选题
在啊种情况下Site Master需要进行校准（）
A
每次使用之前
B
第一次使用时
C
当环境和温度改变时
D
当测量频率范围改变时
参考解析
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