A、B两小球相距7m，A在水平拉力和摩擦阻力作用下，以vA=4m/s的速度向右做

下列图形中：①四边形，②三角形，③正方形，④梯形，⑤平行四边形，⑥圆，从中任取一个图形是轴对称图形的概率为（    ）。

易发生DIC的白血病是（）

A.AML—M1

B.ALL—L

C.AML—M5

D.AML—M3

E.CML—BC

肛窦炎中医辨证为湿热下注，方选（）

A．萆薜渗湿汤

B．龙胆泻肝汤

C．导赤散

D．半夏泻心汤

E．滋水清肝饮

Networks can be interconnected by different devices in the physical layer networks can be connected by (71) or hubs．which just move the bits from one network to an identical network．One layer up we find bridges and switches which operate at data link layer．They can accept (72) ，examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer，we have routers that can connect two networks，If two networks have (73) network layer，the router may be able to translate betweenthe packer formats．In the transport layer we find transport gateway，which can interface between two transport connections Finally，in the application layer，application gateways translate message (74) ．As an example，gateways between Internet e-mail and X，400 e-mail must (75) thee-mail message and change various header fields．

A．frames

B．packets

C．packages

D．cells

（）是认识解决问题的出发点和归宿。

A、整体的功能和效益

B、整体的功能

C、整体的效益

D、部分的功能和效益