关于水的说法正确的是 [ ]
A.将活性炭放入硬水中能使其软化
B.用肥皂水可检验硬水和软水
C.过滤能够除去水中所有杂质
D.向硬水中加明矾净水剂后得到纯水
答案:B
昏迷()
A.尿毒症
B.ARDS
C.肝性脑病
D.急性胃肠功能障碍
E.高血压
The issue of shortening the school time to four days and a half every week _____ at the meeting. [ ]
A. came up
B. came out
C. came to
D. came at