A:NH4Cl=NH3↑+HCl↑
B:Mg+2HCl=MgCl2+H2↑
C:CaO+CO2=CaCO3
D:NaCl+AgNO3=AgCl↓+NaNO3
汽车不用汽油也能行驶.( )
2015•贵州遵义)I am old enough to wash _ clothes by myself. You can just wash _.
在探究串联电路电压关系实验中,物理实验小组按如图所示的电路测得V的示数是3.8V,V1的示数是2.3V,V2的示数应为( )