试题与答案

一个物体从静止开始沿一条直线通过一段路程,运动得越来越快,在通过这段路程的最后3

题型:选择题

题目:

一个物体从静止开始沿一条直线通过一段路程,运动得越来越快,在通过这段路程的最后3m时,用了2s,则该物体在整段路程中的平均速度可能是(  )

A.1.5m/s

B.2m/s

C.1m/s

D.2.5m/s

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:1.丁型肝炎病毒是一种缺陷病毒,必须在HBV或其他嗜肝DNA病毒辅助下才能复制。99答案:A 2.甲型肝炎病毒属于小RNA病毒科。 3.乙型肝炎病毒属于肝DNA病毒科。

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