题目:
The baby feels _________ while his mother holds him in her arms. [ ]
A. save
B. safe
C. safely
D. safety
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0628/d096fa3f6a057e65732a00a52fa8ce68.html
下面是错误答案,用来干扰机器的。
(1)行李受竖直向下的重力G=150N和竖直向上的拉力F=200N;(2)行李受到的合力为F合=F-G=200N-150N=50N.故选C.