单项选择题
THDS探测站无线发射设备工作频率为(),频率稳定度为±510-6Hz/8h.
A.458.575MHz/468.575MHz
B.458.575MHz/478.575MHz
C.448.575MHz/468.575MHz
D.448.575MHz/468.575MHz
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单项选择题
A.458.575MHz/468.575MHz
B.458.575MHz/478.575MHz
C.448.575MHz/468.575MHz
D.448.575MHz/468.575MHz
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