下列物质溶于水,所得溶液的pH大于7的是( )
A:CO2
B:HCl
C:NaCl
D:Ca(OH)2
下列各式计算正确的是( )
6____2=4 10____4=6 9____0=9
4____4=0 4____4=8 7____1=6
- I think Cindy is certainly the No. 1 in the speech contest.
-________. Her spoken English is not as good as Tina's.