A:MnO2+4HCl(浓)= MnCl2+Cl2↑+2H2O
B:CaCO3+2HCl=CaCl2+CO2↑+H2O
C:2HCl+Zn=ZnCl2+H2↑
D:2KMnO4+16HCl=2KCl+2MnCl2+5Cl2↑+8H2O
算式2.5÷( 15 ﹣1)×(2+ 12 )之值为何?( )
说说联合国会徽的图案是什么样子的,它有什么象征意义?表达了人们的什么愿望?
It's said that there are plenty of hotels in that town. There ____________ be any difficulty for you to find somewhere to stay.
下列关于吸烟有害健康的叙述中,不正确的是( )