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问题 单项选择题

患者，女，30岁。带下量多，色黄而稠，少腹隐痛，阴部瘙痒，舌苔黄腻，脉滑数。用药应首选的是（）

A.清热泻火药

B.清热凉血药

C.清热燥湿药

D.清热解毒药

E.利水渗湿药

答案

参考答案：C

单项选择题

具有a个碱基对的一个DNA分子片段，含有m个腺嘌呤，该片段完成第4次复制需要多少个游离的胞嘧啶脱氧核苷酸（）

A.8（a/2-m）

B.8（a-m）

C.16（a/2-m）

D.16（a-m）
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单项选择题

Frame Relay is simplified form of (66) , similar in principle to (67) , in which synchronous, frames of data are routed to different destinations depending on header information.

Packets are routed throught one or more Virtual Circuits known as (68) . Most Virtual Circuits are (69) , which means that the network provider sets up all DLCI connections at subscription time. (70) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.

66（）

A．Datagram Switching

B．Datagram Routing

C．Packet Switching

D．packet Routing
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