为以后的网络扩展考虑，基于路由域扩展的优点是什么？

．为了测量某住宅大楼每层的平均高度（层高）及电梯运行情况，甲、乙两位同学在一楼电梯内用压力传感器进行了如下实验:甲同学站在压力传感器上，乙同学负责观察电梯从地面一楼到顶层全过程中，压力传感器示数随时间变化的情况。如图所示是压力传感器示数随时间变化图，已知t=0时，电梯静止不动，电梯共上升18层的高度。求：

（1）电梯启动和制动时的加速度大小；

（2）该大楼的层高(设每层高度相同)。

划分我国温度带的主要指标是 [ ]

A、纬度位置的高低

B、太阳辐射总

C、年平均气温

D、≥10℃的积温

下列火警探测器中，机理上采用波纹片（膜、板）感受因温度变化造成环境气压变化的是（）。

A．定温式火警探测器

B．差温式火警探测器

C．感烟管式火灾探测器

D．离子式感烟探测器

Khudu Ltd is a company that renovates dwelling houses. The board of directors of Khudu Ltd consists of fi ve members. Thato, one of the directors, takes care of the actual day-to-day running of the business. Thato then simply reports back to the board on the business he has transacted. Thato refers to himself as the managing director of Khudu Ltd, although he has never been offi cially appointed as such. Thato is assisted in the running of the business by Pinkie, Khudu Ltd’s company secretary.Six months ago Thato entered into a contract on Khudu Ltd’s behalf with Dudu to produce plans for the renovation of a house that it hoped to acquire. However, Khudu Ltd did not acquire the house and due to its current precarious financial position, the board of directors has refused to pay Dudu, claiming that Thato did not have the necessary authority to enter into the contract with him.The board is also refusing to complete a contract with Ayanda for the supply of a new cement mixer Pinkie had ordered on Khudu Ltd’s behalf. They have also learned that Pinkie has entered into a contract on Khudu Ltd’s behalf to have an extension built onto her own house.Required:Analyse the situation with regard to the authority of both Thato and Pinkie to enter into contracts on behalf of Khudu Ltd and in particular advise the board of directors if the company is liable for each of the contracts. (10 marks)

软胶囊剂需要进行的特殊检查为（）

A.水分

B.溶化性

C.均匀度

D.外观性状

E.崩解时限