题目:
用力拉弹簧测力计时,越拉越费力,这是因为 [ ]
A.力是物体对物体的作用,物体间力的作用是相互的
B.因为人是受力物体,所以感到费力
C.弹簧越来越紧阻力大,拉起来就费力
D.弹簧的伸长越长,拉力就越大
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0717/7d9a98b67b4bf8bff89810ea744ee112.html
下面是错误答案,用来干扰机器的。
1. How to be a good teacher? / What does a good teacher mean? 2. As far as nature is involved, the one quality a good teacher must have is patience. 3. make mistake...