按灰分的溶解性可分为（）、（）和（）。
参考答案：水溶性灰分；水不溶性灰分；酸不溶性灰分
As we all know the H1N1 Flu is so serious, students can't go into the school ______ they take the
temperature and get sure they don't have a fever. [ ]
A. till
B. after
C. when
D. until
脑复苏过程中，防止脑水肿最重要的措施是（）。
A.输血
B.输高渗溶液
C.头部低温与脱水疗法
D.吸入高浓度氧
E.输碳酸氢钠溶液
