下列均能生津止渴的药为
A.五味子、诃子、生地黄B.五味子、芦根、黄芩C.乌梅、五味子、芦根D.乌梅、生地、黄连E.乌梅、芦根、黄柏
参考答案:C
Mr.Wang often asks us ________ in the class
A. not talk B. not to talk C. don’t talk
已知平面区域D=(x,y)|0≤x≤π,0≤y≤π,L为D的正向边界.试证: