单项选择题
A.BTS B.MSC C.HIR D.BSC
A.20M B.25M C.30M D.50M
A.3欧姆 B.5欧姆 C.10欧姆 D.15欧姆
A.100km/h B.120km/h C.240 km/h D.280km/h
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