治湿热泻痢、里急后重,最宜用()
A.陈皮、黄连
B.木香、黄连
C.青皮、黄连
D.金银花、黄连
E.厚朴、黄连
参考答案:B
— _____. Is this his pencil?
— _____, I don't know. [ ]
A. Sorry ; Excuse me
B. Hello ; Oh
C. Excuse me ; Sorry
D. Hi; Er
焊缝金属合金化的目的是什么?合金化方式有哪些?