梗阻性黄疸时,BUS显示胆总管和肝内胆管均不扩张,为明确诊断应选择哪项检查
A.放射性核素胰腺扫描
B.PTC
C.低张十二指肠造影
D.ERCP
E.CT
参考答案:D
—I'm sorry I've brought you too much trouble.
—_____. [ ]
A. All right
B. That's right
C. That's OK
D. You're welcome
试述发展中国家外资立法对外国投资保护和鼓励的措施?