甲、乙两车在同一水平道路上，一前一后相距S=6m，乙车在前，甲车

甲、乙两车在同一水平道路上，一前一后相距S=6m，乙车在前，甲车在后，某时刻两车同时开始运动，两车运动的过程如图所示，则下列表述正确的是( )

A．当t=4s时两车相遇 B．当t=4s时两车间的距离最大

C．两车有两次相遇 D．两车有三次相遇

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甲、乙两车在同一水平道路上，一前一后相距S=6m，乙车在前，甲车

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