最小的正整数,绝对值最小的数,最大的负整数,这三个数的和为( )
A:0
B:-1
C:+1
D:不确定
What do you ____ ____ the jacket?
如图所示,一对大磁极,中间处可视为匀强磁场,上、下边缘处为非匀强磁场,一矩形导线框abcd保持水平,从两磁极间中心上方某处开始下落,并穿过磁场( )
——Doctor! I can't fall at night.——Don't worry! You are too stressed. Just be relaxed and take some pills, then you'll be better.