计算:-4x2y3÷2xy=______.
原式=(-4÷2)•x2-1y3-1=-2xy2.
故答案为-2xy2.
HPV哪种亚型与外阴癌、宫颈癌关系密切()
A.HPV6、11
B.HPV6、18
C.HPV16、18
D.HPV11、18
E.HPV11、16
You'd better not ________ the radio, or you'll not be able to put it back together again. [ ]
A. take apart
B. take away
C. take out
D. take in