试题与答案

做匀变速直线运动的质点在第一个0.5s内的平均速度比它在第一个1.5s内的平均速

题型:选择题

题目:

做匀变速直线运动的质点在第一个0.5s内的平均速度比它在第一个1.5s内的平均速度大2.45m/s,以质点的运动方向为正方向,则质点的加速度为(  )

A.2.45m/s2

B.-2.45m/s2

C.4.90m/s2

D.-4.90m/s2

答案:

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参考答案:A解析:模型观测器是用于确定义齿就位道的一种仪器,由分析杆、支架和观测台组成,用以测量模型上基牙、余留牙的轴面和牙槽嵴组织的倒凹。

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