女性，30岁，患高血压1年，血压在180～230／100～120mmHg之间，有时感手足乏力麻木，夜尿增多。查体：血钾3．5mmol／L，血浆醛固酮400μg／L。下列检查可鉴别原发性与继发性醛固酮增多症的是（）

A.血浆肾素、血管紧张素Ⅱ活性测定

B.赛庚啶试验

C.血浆ACTH测定

D.上午自立位前后血浆醛固酮浓度变化

E.放射性碘化胆固醇肾上腺扫描或照相

______in the strength of the carrier signal is varied to represent binary 1 or 0．______is a system that can map a name to an address and conversely an address to an name．______is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol______is an approach that enables an ATM Switch to behave like a LAN switch．()is an guided media which is made of glass or plastic and transmits signals in the form of light．

A．Coaxial cable

B．Optical fiber

C．Unshielded Twisted-pair Cable

D．Shielded Twisted-pair Cable