我国的藏族主要居住在( )
A:陕西
B:内蒙古自治区
C:甘肃
D:西藏自治区
看图片,选句子
A. Easter is in April. B.When is mother's day?
C. Summer vacation is in August. D. My birthday is in December.
E. Do you like school trip?
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定义在R上的函数fx满足f4=1.f'x为fx的导函数,已知函数y=f'x的图象如图所示.若两正数a,b满足f2a+b<1,则b+2a+2的取值范围是( )
我国少数民族主要分布是( )