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问题 单项选择题

既能行气止痛，又能温肾散寒缩尿的药物是( )

A．香附
B．乌药
C．沉香
D．川楝子
E．青木香

答案

参考答案：B

解析： 五味药均能行气止痛，香附又能疏肝解郁；沉香又能温肾纳气；乌药又能温肾散寒缩尿；青木香又能解毒消肿；川楝子又能杀虫疗癣。

单项选择题

A transport layer protocol has several responsibilities. One is to create a process-to-process (program-to-program) communication, TCP uses port (1) to accomplish this. Another responsibility of a transport layer protocolis to create a  (2) and error-control mechanism at the transport level. TCP uses a sliding(3) protocol to achieve flow control. It uses the acknowledgment packet, time-out, and retransmission to achieve(4) control. The transport layer is also responsible for providing a connection mechanism for the application program. The application program sends  (5) of data to the transport layer. It is the responsibility of the transport layer at the sending station to make a connection with the receiver.

空白（3）处应选择（）

A.path

B.window

C.frame

D.diagram
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单项选择题

RFLP是指（）。

A.限制性长度多态性

B.DNA片段扩增

C.蛋白质多态性

D.重复多拷贝顺序
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