+1
Na+
-1
Cl-
+2
Mg2+
-2
O2-
猜你喜欢
- 1What's wrong with you,my boy?--My chest __when I male a deep breath ,doctor.A hurts B is hurt
- 2有关错误的作文,400字!
- 3仿句:天空中飘着云彩:有的像羽毛,轻轻地飘在空中;有点像鱼鳞,一片片整整齐齐的排列着;
- 4求反三角函数的值 arcsin1
- 5函数y=(5-3x)/(x+2)的图像关于哪个点对称?说详细点哈.
- 6一个数最小的倍数是26这个数是?
- 71、把下面各比化成最简单的整数比,9:15 0.45:0.3 5/6:7/8 36:3.6 2小时:30分
- 8修改病句:take part in as much group activities as you can
- 9潜艇完全潜入水中,再继续下潜时
- 10在△ABC中,AD是∠BAC的平分线,E、F分别为AB、AC上的点,且∠EDF+∠EAF=180°,求证DE=DF.