水的硬度(H),表示水中高价()离子的总含量。
A.平整
B.屈服平台
C.金属
D.张力卷取机
参考答案:C
Everybody showed great respect to the old doctor, who devoted everything he had to _____ the poor conditions of the local hospital.
A.improving
B.improve
C.improved
D.being improved
甲亢131I治疗后禁碘时间为()。
A.1个月
B.2个月
C.3个月
D.4个月
E.6个月