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问题 填空题

已知：A、B两地相距3千米，甲、乙两人的速度分别是a千米/时、b千米/时，若甲从A地、乙从B地同时出发，相向而行，那么，到他们相遇时，所用的时间是______小时．

答案

由时间=路程÷速度可知，

两人相遇时间为

3
a+b
．

选择题

—Mummy, could you buy me a dress like this?

—Certainly. We can buy ______ one than this, but________ this

A．a better, better than

B．a worse, as good as

C．a cheaper, as good as

D．a more expensive, not as good as
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问答题 简答题

运送超重、超高、超长、超宽的设备、材料时，应注意什么？
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