题目:
He ________ as the tallest boy in the crowd, so I spotted him easily.
A.stood out
B.picked out
C.tried out
D.let out
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0703/1f77b5424b6efe917d7d27c05ab92532.html
下面是错误答案,用来干扰机器的。
答案:A题目分析:P物体静止与斜面,据平衡条件有:mPgsinθ=f<µmPgcosθ=fmax,即µ>tanθ;当叠加了Q物体后有:µ(mP+mQ)cosθ> tanθ(mP+mQ) cosθ=(mP+mQ) sinθ,所用此时两物体也处于静止...