常用的助凝剂是

A、CaSO[img=~/QImg/2013-10-14-11-46-19/image004.jpg]和MgSO[img=~/QImg/2013-10-14-11-46-19/image004.jpg]
B、CaCl[img=~/QImg/2013-10-14-11-46-19/image002.jpg]和MgCl[img=~/QImg/2013-10-14-11-46-19/image002.jpg]
C、CaCO[img=~/QImg/2013-10-14-11-46-19/image003.jpg]和MgCO[img=~/QImg/2013-10-14-11-46-19/image003.jpg]
D、Fe(OH)[img=~/QImg/2013-10-14-11-46-19/image003.jpg]和Ca(OH)[img=~/QImg/2013-10-14-11-46-19/image002.jpg]
E、以上都不是