-22+(-2)2+(-2)3+23的结果是( )
A.-8
B.0
C.8
D.-24
-22+(-2)2+(-2)3+23
=-4+4-8+8
=0.
故选B.
在间壁式换热气中,冷热流体的流向可分为()四种。
12. The little boy walks ____ he _____ an old man.
A. as if, likes B. as though, were c. even if, likes D. even though, were