—How are you today?
—Oh, I as ill as I do now for a long time.
A:didn't feel
B:wasn't feeling
C:don't feel
D:haven't felt
如图所示,一轻质细杆两端分别固定着质量为mA和mB的两个小球A和B(可视为质点),将其放在一个直角形光滑槽中,已知轻杆与槽右壁成α角,槽右壁与水平地面成θ角时,两球刚好能平衡,且α≠0,则A、B两小球质量之比为( )
如图,等腰三角形ABC中,AB=AC,BD平分∠ABC,∠A=36°,则∠1的度数为( )