我国水资源时空分布特点是( )
A:东少西多
B:春夏少,秋冬多
C:南少北多
D:夏秋多,冬春少
宋朝的纸币不包括( )
As is often the case, little Tom, if ____________, is most likely to stop crying soon.
已知方程x2-5x+2=0的两个解分别为x1、x2,则2x1-x1x2+2x2的值为( )