下列从左边到右边的变形,是因式分解的是( )
A:3-x3+x=9-x2
B:-3xx+y-z=-3x2-3xy+3xz
C:m3-mn2=mm+nm-n
D:4yz-2y2z+z=2y2z-yz+z
可导致环境人口容量降低的因素有()
家兔是植食性动物,它的消化道区别于人类的最大特点是( )
— Can you tell me the differences between these two pictures?
— Oh, no. They look quite _______, nearly the same.
罗斯福新政的特点不包括( )