属于表面活性物质的是()
A、NaF
B、ALF3
C、AL2O3
D、MgF2
参考答案:A, C
下列何药对鳞癌疗效好:
A.多柔比星B.柔红霉素C.放射菌素DD.丝裂霉素E.博来霉素
There's a man at the reception desk who seems very angry and I think he means _____ trouble. [ ]
A. making
B. to make
C. to have made
D. having made