成年人术前禁食禁饮导致的水分丧失量大约为()
A.1~2ml/kg
B.3~5ml/kg
C.6~7ml/kg
D.8~10ml/kg
E.11~13ml/kg
参考答案:D
基于操作员的安全性提供了一个比基于操作站的安全性更高的()。
—Could you please tell us_________ the World EXPO in Shanghai? – In July.
A.when you visited
B.why you visited
C.when did you visit
D.why did you visit