单项选择题
A.≥500m B.≥1000m C.≥2000m D.≥2500m
A.450KHzVHF～470KHzUHF B.450KHzVHF～470KHzVHF C.420KHzVHF～450KHzVHF D.420KHzVHF～450KHzUHF
A.100W B.200W C.250W D.300W
A.75V B.80V C.85V D.90V
微信扫一扫,加关注免费搜题
