问题
选择题
—What’s wrong with him?
—The picture he came across his memory of a sad story in his childhood.
A．put off
B．took off
C．set off.
D．gave off
答案
答案：C
搜题请搜索小程序“爱下问搜题”
—What’s wrong with him?
—The picture he came across his memory of a sad story in his childhood.
A．put off
B．took off
C．set off.
D．gave off
答案：C
的小物块轻轻放上倾角为
（
）的斜面，已知斜面质量也为
．斜面放在足够粗糙的水平地面上没有滑动，那么地面对斜面的支持力
和摩擦力
有可能为（ ）
,
,