单项选择题
A.10km B.30km C.50km D.100km
A.32 B.64 C.96 D.128
A.dBd=2.15+dBi B.dBd=2.15-dBi C.dBi=2.15+dBd D.dBi=2.15-dBd
A.1dBi=1dBd B.1dBi=1dBd+2.15 C.1dBd=1dBi+2.15 D.无法换算
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