这个标志是什么意思？

189. 这个标志是什么意思？

单选题正确率: 77%

A. 白天的限速为 30 公里/小时 B. 当有工人在场时，限速为 30 公里/小时 C. 前方短距离内限速为 30 公里/小时 D. 在有标牌指示时，限速为 30 公里/小时

恭喜，答对了！ {{vm.result.explain}}

答案不正确！ {{vm.result.explain}}

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