∵a2b=-ab成立,
∴a≤0,b≥0.
故选B.
下列关于离子化合物、共价化合物的叙述正确的是[ ]
A.离子化合物可能含有共价键
B.共价化合物可能含离子键
C.离子化合物中一定含有金属离子
D.共价化合物可以在熔融状态下导电
Alien had to call a taxi because the box was _____ to carry all the way home.
A.much too heavy
B.too much heavy
C.heavy too much
D.too heavy much