单项选择题
A.通号 B.工务 C.AFC D.门梯
A.JA1、JA2 B.JB1、JB2 C.JC1、JC2 D.JD1、JD2
A.5% B.10% C.15% D.18%
A.45% B.55% C.65% D.75%
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