下图是“大气垂直分层”图,图中三个垂直分层的名称,正确的是( )
A:①对流层
B:②臭氧层
C:③平流层
D:③电离层
—How do you find the new movie Kung-Fu Yoga?
— .A great work by Jackie Chen!
划分发达国家与发展中国家的依据是( )
____ ____ ____ ____ ____an English party next Friday.
使3x-1有意义的x的取值范围是( )