试题与答案

桥墩没入水下部分的体积为103m3,桥墩受到的浮力是______N.船闸工作原理

题型:填空题

题目:

桥墩没入水下部分的体积为103m3,桥墩受到的浮力是______N.船闸工作原理是______.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:1、螺纹连接,2、用固定钢丝连接,3、用钢丝挡圈固定4、用半园环连接。

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题型:单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (1) 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 (2) , 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 (3) 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 (4) . As an example, gateways between Internet e-mail and X.400 e-mail must (5) the e-mail message and change various header fields.

A.special

B.dependent

C.similar

D.dissimilar

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