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. 白天的限速是30公里/小时 B. 有工人在场时的限速是30公里/小时 C. 前方短距离内的限速是30公里/小时 D. 有标示时的限速是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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