试述胃镜检查的适应证、禁忌证。
既能通经，又能治湿热黄疸、淋浊带下，还可治水火烫伤、毒蛇咬伤、热结便秘等证的药物是（） ["大黄","虎杖","金钱草","垂盆草","茵陈蒿"]
既能利水通淋，又能活血通经的药物是（） ["灯心草","石韦","金钱草","海金沙","瞿麦"]
用于暑湿泄泻，利小便以实大便的首选药物是（） ["滑石","车前子","金钱草","虎杖","垂盆草"]
内服能通淋解暑，外用能清热收湿的药物是（） ["滑石","车前子","萹蓄","木通","瞿麦"]
常用内镜分为几类？
