∵a-3+|b-4|=0,
∴a-5=0,b-4=0,
解得a=3,b=4,
∴ab=34,
∴±ab=±34=±32.
测知含一种杂质的Fe2O3粉末中含氧32.5%,则这种杂质不可能是( )
A.MgO
B.Fe(OH)3
C.FeO
D.Al2O3
There are _____ apples on the table. You can have one. [ ]
A. few
B. a little
C. little
D. a few