当校车停下让儿童上下车时，车辆的限速是多少？

30. 当校车停下让儿童上下车时，车辆的限速是多少？

单选题正确率: 94%

A. 20公里/小时 B. 30公里/小时 C. 40公里/小时 D. 50公里/小时

恭喜，答对了！ {{vm.result.explain}}

答案不正确！ {{vm.result.explain}}

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