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问题 单项选择题

执业药师申请到外省（自治区、直辖市）执业的，重新申请注册前应办理（）

A．首次注册

B．再次注册手续

C．变更注册手续

D．注销注册手续

E．不予注册

答案

参考答案：C

解析：

[知识点] 《执业药师资格制度暂行规定》：执业药师的注册

单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (41) 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 (42) , 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 (43) network layer, the router may be able to translate between the packet 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 (44) . As an example, gateways between Internet E-mail and X.400 E-mail must (45) the E-mail message and change various header fields.

A．special

B．dependent

C．similar

D．dissimilar
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单项选择题

平均负荷与最大负荷（），称为负荷系数。

A.之和

B.之差

C.之积

D.之比
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