A:good; good
B:good; well
C:well; good
D:well; well
下列有关声现象的说法中,正确的是 ( )
下列对课文《夜雨诗意》分析有误的一项是( )。
①NH2+CO2+X=NH4HCO3
②NH4HCO3+NaCl=NH4Cl+NaHCO3↓
③2NaHCO3 △__ Na2CO3+H2O+CO2↑
请回答下列问题:
—______ do you visit your grandparents?
— Every two weeks.