搜题请搜索小程序“爱下问搜题”
问题 单项选择题

某框架一核心筒结构底层一连梁如图6-25所示，连梁截面bb=400mm，hb=1800mm，混凝土强度等级C35，（fe=16.7N/mm2），水平地震作用组合连梁剪力设计值V=840kN，当连梁中交叉暗撑与水平线夹角为α，sinα=0.66时，交叉暗撑采用HRB400钢。交叉暗撑计算所需纵向钢筋最接近于（）。

A.A

B.B

C.C

D.D

答案

参考答案：C

解析：

根据《高层建筑混凝土结构技术规程》(JGJ3-2002、J186-2002)第9.3.8条第2款，有地震作用组合时，暗撑纵向钢筋总面积为：

As=γREVb/2fysinα=0.85×840×103/2×360×0.66=1503mm2；422钢筋的截面面积为：As=4×380=1520mm2，符合要求。

单项选择题

Networks can be interconnected by different devices. In the physical layer networks can be connected by (31) 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 (32) , examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process. In network layer, we have routers that can connect two networks. If two networks have (33) network layer, the muter 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 (34) . As an example, gateways between Internet e-mail and X.400 e-mail must (35) the e-mail message and change various header fields.

（31）是（）

A.reapers

B.relays

C.packages

D.modems
查看答案
单项选择题

在WIN2000下，查看MAC地址需要使用的命令是：（）

A.ifconfig–a

B.ipconfig–all

C.ipcfg–all

D.winipcfg
查看答案