铜管直径D=10mm,流量Q=4.71L/min,在10m管长上的水头损失为1.91

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问题:

铜管直径D=10mm,流量Q=4.71L/min,在10m管长上的水头损失为1.918m,则其沿程损失系数是()。

A.0.03

B.0.0376

C.0.025

D.0.017

考点:电气工程公共基础第六章流体力学第六章流体力学题库
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单纯疱疹病毒性脑炎如果出现典型的复杂部分性痫性发作多提示________和__________受损。

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下面的语段中划线的两个句子都有语病,请在原文中改正。(4分)

2012年2月6日是农历正月十五,①当人们沉浸在喜庆团圆的元宵节气氛中时,铁路部门上演了感人的一幕爱心接力。一位远在河北衡水的老人病重,急需一种特效药治疗,这种药品通过铁路部门送到湖北襄阳,再通过由北京铁路局天津客运段负责营运的K258次列车送到衡水,②老人的“救命药”经过两千多公里的辗转接力最终顺利

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Passage Two

In 1998 consumers could purchase virtually anything over the Internet. Books, compact discs, and even stocks were available from World Wide Web sites that seemed to spring up almost daily. A few years earlier, some people had predicted that consumers accustomed to shopping in stores would be reluctant to buy things that they could not see or touch in person. For a growing number of time-starved consumers, however, shopping from their home computer was proving to be a convenient alternative to driving to the store.
A research estimated that in 1998 U.S. consumers would purchase $ 7.3 billion of goods over the Internet, double the 1997 total. Finding a bargain was getting easier, owing to the rise of online auctions and Web sites that did comparison shopping on the Internet for the best deal.
For all the consumer interest, retailing in cyberspace was still a largely unprofitable business, however. Internet pioneer Amazon. com, which began selling books in 1995 and later branched into recorded music and videos, posted revenue of $153.7 million in the third quarter, up from $ 37.9 million in the same period of 1997.Overall, however, the company’s loss widened to $ 45.2 million from $ 9.6 million, and analysts did not expect the company to turn a profit until 2003.Despite the great loss, Amazon com had a stock market value of many billions, reflecting investors’ optimism about the future of the industry.
Internet retailing appealed to investors because it provided an efficient means for reaching millions of consumers without having the cost of operating conventional stores with their armies of salespeople. Selling online carried its own risks, however. With so many companies competing for consumers’ attention, price competition was intense and profit margins thin or nonexistent. One video retailer sold the hit movie Titanic for $ 9.99, undercutting (削价) the $19.99 suggested retail price and losing about $ 6 on each copy sold.With Internet retailing still in its initial stage, companies seemed willing to absorb such losses in an attempt to establish a dominant market position.

Which of the following is true, according to the writer

A.Consumers are reluctant to buy things on the Internet.

B.Consumers are too busy to buy things on the Internet.

C.More and more consumers prefer Internet shopping.

D.Internet retailing is a profitable business.

题型:单项选择题

下列说法中体现矛盾特殊性原理的有()

A.天有阴睛,人有祸福

B.因地制宜,因材施教

C.物极必反,相辅相成

D.对症下药,量体裁衣

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博大广告公司成立于2000年7月,原股东为王某和张某,其中王某出资占出资总额的51%,张某占49%。2001年5月,公司股东会决议通过了转让出资的决定,同意王某所持有的51%的出资额转让给陈某,陈某受让后成为该广告公司新的大股东,并通过选举担任公司法定代表人、执行董事兼总经理。但是一直以来,作为小股东的张某却实际控制着公司的公章、法人章、财务章和营业执照正、副本,从未让陈某参与过公司的经营管理;陈某也从未按章程享受过分红、查阅财务会计报告等相应的股东应该享受的权利;张某近2年来始终拒绝召开股东会。现在陈某有哪一种合法并可行的手段维护自己的利益( )

A.请求公司按照合理的价格收购其股份
B.寻找第三方转让股份
C.扣押公司财产抵偿自己应得的红利
D.请求法院解散公司

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