How would you like if you were watching your favorite TV program and someone came into the room and just shut it off without asking you?
A:them
B:one
C: those
D:it
绿矾又名七水硫酸亚铁(FeSO4•7H2O),其用途广泛,可用于制铁盐、氧化铁颜料、净水剂、防腐剂、消毒剂等.绿矾(FeSO4•7H2O)的一种综合利用工艺如下: