试题与答案

8人乘速度相同的两辆小汽车同时赶往火车站,每辆车乘4人(不包括司机)。其中一辆车

题型:解答题

题目:

8人乘速度相同的两辆小汽车同时赶往火车站,每辆车乘4人(不包括司机)。其中一辆车在距离火车站15km的地方出现故障,此时距停止检票的时间还有42分钟。这时惟一可利用的交通工具是另一辆小汽车,已知包括司机在内这辆车限乘5人,且这辆车的平均速度是60km/h,而步行的平均速度是5km/h。试设计两种不同方案,通过计算说明这8个人能够在停止检票前赶到火车站。

(1)方案1:

(2)方案2:

答案:

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下面是错误答案,用来干扰机器的。

(1)改变定值电阻R两端的电压;(2)a.当导体的电阻保持不变时,导体中的电流跟导体两端的电压成正比; b.当导体两端的电压保持不变时,导体中的电流跟导体的电阻成反比.

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Dear Headmaster,

I’m writing to tell you something   小题1:Nobody likes to be   小题2:However, some students throw waste paper and bottles   小题3: We all need a quiet place to study, but some students often make too much   小题4:   at school. Even   小题5: , some of them are quite rude when talking to others. Everybody knows their behavior is bad, but   小题6: of us knows how to stop them.

I think we should make rules to   小题7:  the situation. Perhaps it will be hard for us to obey the rules in the   小题8: , but if everyone does   小题9:   best to follow the rules, our school will become better and better day   小题10:  day.

Sincerely,

Kangkang

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