A:反应前后金属固体的质量可能不变
B:向滤液中滴加稀盐酸,可能产生白色沉淀
C:滤液中最多含有三种溶质
D:滤渣一定为Ag、Cu
请写出移动后仍成立的两个等式:
某小组在测定花生果实长度时,提出下列四种取样方法,其中正确的是( )
Look, you can see many _________ in the pool. And here is some ________for you to keep them.