经典的H1受体拮抗剂不包括哪类()
A.乙二胺类
B.氨基甲酸酯类
C.哌嗪类
D.丙胺类
E.三环类
参考答案:B
直流电疗法适应证包括()
A.急性湿疹
B.血栓性静脉炎
C.心力衰竭
D.出血倾向
E.骨折以金属内固定术后
Mr Zhang finds very hard to travel around the big city.[ ]
A. them
B. its
C. it
D. they're