如果a>b ,下列各式中不正确的是( )
A:a-3>b-3
B:-2a<-2b
C:a2>b2
D:1a<1b
①
②
③
④
⑤
⑥
⑦
⑧
原子半径(10﹣10m)
0.74
1.60
1.52
1.10
0.99
1.86
0.75
0.82
最高或最低化合价
+2
+1
+5
+7
+3
﹣2
﹣3
﹣1
回答下列问题:
- These problems are too hard to . Will you give me some advice?
- There are many ways. The most important is to have a careful plan.