如图,风管直径D=100mm,空气重度γ=12N/m3,在直径d=50mm的喉部装一

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问题:

如图,风管直径D=100mm,空气重度γ=12N/m3,在直径d=50mm的喉部装一细管与水池相接,高差H=150mm,当汞测压计中读数△h=25mm时,开始从水池中将水吸入管中,那么此时的空气流量为()。

A.0.180m3/s

B.0.360m3/s

C.1.80m3/s

D.3.60m3/s

考点:注册公用设备工程师暖通空调专业知识管道计算
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The Bush administration is about to propose far-reaching new rules that would give people with disabilities greater access to tens of thousands of courtrooms, swimming pools, golf courses, stadiums, theaters, hotels and retail stores. The proposal would substantially update and rewrite federal standards for enforcement of the Americans With Disabilities Act, a landmark civil rights law passed with p bipartisan support in 1990. The new rules would set more stringent requirements in many areas and address some issues for the first time, in an effort to meet the needs of an aging population and growing numbers of disabled war veterans.

More than seven million businesses and all state and local government agencies would be affected. The proposal includes some exemptions for parts of existing buildings, but any new construction or renovations would have to comply. The new standards would affect everything from the location of light switches to the height of retail service counters, to the use of monkeys as "service animals" for people with disabilities, which would be forbidden’.

The White House approved the proposal in May after a five-month review. It is scheduled to be published in the Federal Register on Tuesday, with 60 days for public comment. After considering those comments, the government would issue final rules with the force of law. Already, the proposal is stirring concern. The United States Chamber of Commerce says it would be onerous and costly, while advocates for disabled Americans say it does not go far enough.

Since the disability law was signed by the first President Bush, advances in technology have made services more available to people with disabilities. But Justice Department officials said they were still receiving large numbers of complaints. In recent months, the federal government has settled lawsuits securing more seats for disabled fans at Madison Square Garden in New York and at the nation’s largest college football stadium, at the University of Michigan.

The Justice Department acknowledged that some of the changes would have significant costs. But over all, it said, the value of the public benefits, estimated at $ 54 billion, exceeds the expected costs of $ 23 billion. In an economic analysis of the proposed rules, the Justice Department said the need for an accessible environment was greater than ever because the Iraq war was "creating a new generation of young men and women with disabilities". John L. Wodatch, chief of the disability rights section of the Justice Department, said:"Disability is inherent in the human condition. The vast majority of individuals who are fortunate enough to reach an advanced age will benefit from the proposed requirements.

The current public comments on the proposal are()

A. accordant

B. pleasant

C. impractical

D. inconsistent

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A、飞散性、附着性较小

B、吸湿性、聚集性较小

C、颗粒剂可包衣或制成缓释制剂

D、干燥失重不得超过8%

E、可适当加入芳香剂、矫味剂、着色剂

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金属的气割过程其实质是金属在()。

A、纯氧中的燃烧过程

B、空气中的燃烧过程

C、纯氧中的熔化过程

D、空气中的熔化过程

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“枪杆子里出 * * ”是谁提出的?

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决策支持系统是由三个基本部件组成的,其中负责为决策提供利用资料进行推理、比较、分析和选择的部件是 ______ ,负责提供支持决策的数据和信息的部件是 ______ ,负责为决策者提供使用系统接口的部件是 ______。

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