降低脑水肿时甘露醇的正确用法是()。
A.缓慢静脉滴注
B.快速静脉滴注
C.静脉注射
D.配合使用速尿,可减少反跳
E.一次注射时间不得少于30分钟
参考答案:B, C
---How long have you retired ,Grandpa?
---Well, four years. But you know, I_____ for Courtaulds for over forty years.
A.have worked
B.worked
C.had worked
D.work
对100mm和200mm的立方体试块,测得立方体抗压强度分别应乘以换算系数是多少?