这个标志是什么意思？

389. 这个标志是什么意思？

单选题正确率: 70%

A. 速度限制将很快变为45公里/小时 B. 速度限制为45公里/小时 C. 前方安全速度为45公里/小时 D. 下一个城镇距离45公里

恭喜，答对了！ {{vm.result.explain}}

答案不正确！ {{vm.result.explain}}

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