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问题 单项选择题

现行的国际集装箱标准中第1系列共13种集装箱，其宽度一均一样，长度有四种，分别是12192mm、9125mm、（）mm、2991mm。

A.6085mm

B.6048mm

C.6058mm

D.6038mm

答案

参考答案：C

单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （） 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 （） , 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 （） 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 （） . As an example, gateways between Internet e-mail and X.400 e-mail must （） the e-mail message and change various header fields.

They can accept（）, examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process.

A．frames

B．packets

C．packages

D．cells
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下列关于17—18世纪英法美资产阶级革命相同点的表述，正确的是 

A．都是由于封建专制统治阻碍资本主义发展导而爆发

B．革命过程中各处死了一位暴君

C．都以暴力斗争方式进行

D．最终都建立了资产阶级共和国
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