A:NaHCO3===Na++H++
B:NaHSO4===Na++H++
C:MgCl2===Mg2++2Cl-
D:Ba(OH)2===Ba2++2OH-
选出一个与你所听到的内容相符合的选项( )
世界上首次完成环绕地球航行一周的壮举的是
- Mum. Your pizza______ so nice.
- Thanks! Would you like to try some?