单项选择题
A.5m B.6m C.7m D.8m
A.红色警告灯 B.黄色警告灯 C.前白后红的标志灯 D.黄色标志灯
A.15% B.18% C.20% D.24%
A.8% B.5% C.10% D.15%
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