______+235=653______-85=85.
653-235=418,
则418+235=653;
85+85=170,
则170-85=85.
故答案为:418,170.
脊椎动物进化的顺序是( )
A.
B.鱼类→两栖类→爬行类→哺乳类→鸟类
C.鱼类→两栖类→爬行类→鸟类→哺乳类
D.
下列各组中互为同位素的是( )
A.O2和O3
B.1H 和2H
C.H2O和H2O2
D.O2–和O