PTC主要用于（）。
A.确定胆道阻塞的部位和性质
B.慢性胰腺炎的诊断
C.胰体癌的诊断
D.胰岛细胞瘤的诊断
E.胰腺假囊肿的诊断
参考答案：A
Questions 33 to 35 are based on the passage you have just heard.
A．Provide more outdoor clothing and apparatus.
B．Turn their attention to female customers.
C．Make the shopping area as comfortable as home.
D．Make the shopping environment more exciting.
鉴别下列物质所使用的方法或试剂，错误的是
A．氧气与氮气——闻气味
B．氯化钠与碳酸钠——稀盐酸
C．铝与铝合金——比较硬度
D．氢氧化钠固体和碳酸钙固体——水
