问题
选择题
—What's wrong with you?
—I had a headache, maybe I ate . [ ]
A. something bad
B. bad something
C. anything bad
答案
答案：A
搜题请搜索小程序“爱下问搜题”
—What's wrong with you?
—I had a headache, maybe I ate . [ ]
A. something bad
B. bad something
C. anything bad
答案：A
，最大静摩擦力与滑动摩擦力大小视为相等。求下列情况中物体受到的摩擦力：
=10 N的拉力时；
=30 N的拉力时。 
