计算:(4x2y2-2x3y)÷(-2xy)=______.
(4x2y2-2x3y)÷(-2xy),
=4x2y2÷(-2xy)+(-2x3y)÷(-2xy),
=-2xy+x2.
液下喷射的氟蛋白泡沫发泡倍数较低,一般在()倍左右。
A、2.0
B、3.0
C、4.0
D、5.0
The baseball is _______ the tennis basket.[ ]
A. next
B. next to
C. between
D. of