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问题 单项选择题

甲公司与乙公司签订的商标使用许可合同中规定：甲公司将其所有“葵花”牌商标许可乙公司在全国范围内使用，期限5年。甲公司在此期限内可以继续使用该商标但不得许可他人使用。此商标转让属于( )。

A．独占使用许可

B．排他使用许可

C．普通使用许可

D．特殊使用许可

答案

参考答案：B

单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (11) 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 (12) ,examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have (13) network layer, the router may be able to translate between the 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 (14) . As an example, gateways between Internet e-mail and X.400 e-mail must (15) the e-mail message and change various header fields.

（12）是（）

A.frames

B.packets

C.packages

D.cells
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选择题
平行六面体的棱长都是a，从一个顶点出发的三条棱两两都成60°角，则该平行六面体的体积为（　　）
A．a3B．
1
2
a3		C．
2
2
a3		D．
3
2
a3
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