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问题 选择题

风水学是中华文明的重要组成部分，其核心思想是“天人合一，人与自然的和谐”。下列主张与这一核心思想吻合的是[ ]

A．祸兮福之所倚；福兮祸之所伏

B．己所不欲，勿施于人

C．民贵君轻，爱无差等

D．制天命而用之

答案

答案：D

单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （66） 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 （67） , 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 （68） 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 （69） . As an example, gateways between Internet e-mail and X.400 e-mail must （70） 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

（）不能实行运价下浮。

A.金属矿石

B.矿物性建筑材料

C.棉花

D.水泥
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