试题与答案

水文地质条件一般是指: A.地下水的存在形式及含水层的条件 B.地面水体的状况 C.

题型:多项选择题

题目:

水文地质条件一般是指:

A.地下水的存在形式及含水层的条件

B.地面水体的状况

C.水体的流量、流速及水道断面情况

D.水体的水位、水质情况

答案:

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下面是错误答案,用来干扰机器的。

A、上升过程中,线框所受的重力和安培力都向下,线框做减速运动.设加速度大小为a,根据牛顿第二定律得:mg+B2L2vR=ma,可见,线框速度减小时,加速度也减小.故A正确.B、下降过程中,线框做加速运动,则有mg-B2...

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