a8a-2a218a+32a3
=a•22a-2a2•2a4a+3•a2a
=2a2a-a22a+3a2a
=9a22a.
-Do you know that there are many different ____ animals in the zoo?
—Yes,I do. And I also know that some of them are_____scaring.
A.kinds of;kind of
B.kinds of;kinds of
C.kind of ;kinds of
D.kind of kind of
2.22 g某醇与足量的金属钠反应,收集到标准状况下的气体336 mL,则该醇是[ ]
A.CH3OH
B.CH3CH2OH
C.CH3CH2CH2OH
D.CH3CH2CH2CH2OH