A:摸出的四个球中至少有一个球是白球
B:摸出的四个球中至少有一个球是黑球
C:摸出的四个球中至少有两个球是黑球
D:摸出的四个球中至少有两个球是白球
我国关于人口问题的国策是:( )
Women are so accustomed to decades of __________ and to __________ histories of women whose contributions went unnoticed that they assume these conditions still exist today.
如图,下列判断不正确的是( )