A:2c(SO42﹣)+c(OH﹣)=c(NH4+)+3c(Fe3+)+c(H+)
B:c(NH4+)=c(Fe3+)
C:c(NH4+)= 12 c(SO42﹣)
D:c(OH﹣)>c(H+)
In the big earthquake all their houses were________,so they had to build new ones.
5个人排成一排,其中甲、乙两人至少有一人在两端的排法种数有( )
下列史实属于英法联军摧残中华文明的滔天罪行是( )
(2015•广东佛山)Last night, thousands of people ________ to see the stars arrive at the ceremony.