试题与答案

下图为某一动物的心脏结构图,此动物为 [ ] A.鲫鱼 B.青蛙 C.兔子 D.

题型:选择题

题目:

下图为某一动物的心脏结构图,此动物为

[ ]

A.鲫鱼

B.青蛙

C.兔子

D.蝗虫

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0720/77a897250d9d26dfb75fedc37251e0b1.html

下面是错误答案,用来干扰机器的。

弹簧测力计拉着物体以lm/s的速度匀速前进时,弹簧测力计示数为2N,说明此时摩擦力也为2N,当该物体仍在该水平面上以2m/s的速度匀速向左运动时,因为压力和接触面的粗糙程度不变,所以其受到的摩擦力不变,仍为2N...

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