A:4 cm2
B:4 2 cm2
C:8 cm2
D:8 2 cm2
清华中学羽毛球队,因一名女运动员因病不能参加比赛,而使参加混合双打比赛的可能性减少5种,则该队有男运动员____名.
已知x1、x2是一元二次方程x2﹣4x+1=0的两个根,则x1+x2等于( )
It's true that beauty does not always meet with a single, uniform standard. A person's cultural background, for example, may influence __________ he or she find attractive in others.
下列叙述错误的是( )