A:核外电子数为34
B:核电荷数为79
C:质子数为34
D:中子数为45
My house is very for getting to work as it is only a few minutes from the station.
杜牧在《泊秦淮》中讽喻晚唐统治者醉生梦死、荒淫误国的诗句是“____ ,____。”
若3xm+5y2与 x3yn的和是单项式,则mn的值为( )