功率因数低的原因是什么？

政府一面让出洋幼童学习西方语言、文化、科技等知识，一面要求幼童学习汉语和四书五经、圜朝例律、圣谕广训，向他们灌输三纲五常等中国传统道德观念。这表明政府主张[ ]

A．西学中源

B．中体西用

C．君民共主

D．道德救国

在波特的战略管理理论中，用于分析一个国家在某产业中竞争优势的是（）。

A.五力模型

B.钻石模型

C.价值链理论

D.吸引力测试

For many the idea of your dream home is not buying a bigger home，but a home that you have built by yourself. A house that is unique and fit for your tastes and your lifestyle. It sounds great but where do you begin to design your dream home? Here is a quick guide that can help you make your dreams come true.

The first step is to get an idea of what type of home you want. You can get inspiration from others. Drive around to neighbourhoods that have the styles of homes you like and take pictures. You can also cut out pictures from magazines, newspapers, or print out pictures you find on the Internet.

The next step will be to make two lists of items for yourself. The first list will be those items or features that you feel your new home must have，such as granite counter tops or a hot water heater. The second list will be those items or features that are on your wish list like a fireplace or slate floors.

At this point you will probably have a good idea of what your dream home will look like, so you will need to seek some professional help. You will need to hire an architect to put your ideas down on paper.You may need to interview a few different architects to find one that you are comfortable with. Make sure whomever you choose for final drawings has a full understanding of local building codes and zoning by­laws. In any ease your final plan will need to be approved by the city and a building permit must be obtained before any construction can begin.

It is time to look for a contractor(承包人). Whichever way you can do it in, be sure you are comfortable with your contractor and you have got references from his past clients. Remember the more homework you do in the beginning, the more enjoyable the process will be.

下列说法哪项不对（）

A.免疫原极少为单一成分

B.颗粒性抗原主要是指细胞抗原或细菌抗原

C.可溶性抗原主要是蛋白质、糖蛋白、脂蛋白等物质

D.抗原的纯化并不是制备特异性抗体的先决条件

E.免疫原是诱导机体产生抗体的物质

Network managers have long (140) practical voice-over-IP (VOIP) solutions. VOIP (141) ease network management and decreases costs by converging a company’s telephony and data infrastructures into one network. And a VOIP solution implemented at a company’s head-quarters with far-reaching branch offices can (142) tremendous amounts of (143) in long distance phone bills, provided that solution delivers POTS-like voice (144) over the Internet.

（143）是（）

A.cash

B.money

C.space

D.time