已知某水厂生产规模为5×104m3/d,水厂自用水量为5%,波纹板反应池设计为两组,

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问题:

已知某水厂生产规模为5×104m3/d,水厂自用水量为5%,波纹板反应池设计为两组,平均水深为2.8m,每组分三段,各段长与池宽相等,均为9.8m,其中前段共有5个廊道,每个廊道宽0.55m,中段共4个廊道,每个廊道宽0.75m,第三段共4个廊道,每个廊道宽0.95m。水流在波纹板间来回水平流动,波纹板反应池总水头损失为0.4m,不计波纹板厚,反应池总停留时间约为()。

A.14.4 min

B.15.8 min

C.16.2 min

D.12.5 min

考点:注册公用设备工程师给水排水专业勘察设计注册公用设备工程师给水排水专业案例上午
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下列关于生物病毒的叙述中,不正确的是:

A.生物病毒没有细胞结构

B.生物病毒具有遗传物质

C.计算机病毒属于生物病毒

D.生物病毒不能独立生活

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地方性氟中毒可表现为()

A.智力低下

B.骨质硬化与骨质疏松

C.多发性病理骨折

D.视野缩小

E.皮肤色素沉着

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Japan owes a lot to China. Chinese demand for Japanese goods has helped Japan’s economy recover, while competition has pressured executives to start restructuring Japan’s companies and banks. Japan is an example of how China is offering two benefits to the global economy. One is the way in which China is acting as an economic engine, buying up ever-increasing amounts of goods and natural resources. The other is the flow of inexpensive Chinese goods that drag down consumer prices across the world. There are downsides, like the decline of manufacturing industries from Detroit and Perth. Folks in developed economies losing jobs or taking pay cuts would hardly agree that China’s rising influence is a good thing. But at the moment, China’s 9.5 percent growth rate is proving more of a blessing than a bane for countries like Japan. Quietly, at the start of this decade, Japanese companies began shifting production abroad, cutting costs, selling off extraneous businesses and paying down debt. ’The government also stepped up efforts to attract more foreign direct investment, something Japan had little use for in the past. Taken together, these actions largely prompted by China’s advance, have led to the most organic and convincing recovery Japan has seen in years. While Japan has much further to got to make its economy more globally competitive, it is worth noting how far it has come from the dark days of the late 1990s. There are many benefits inherent in China’s advance. One of them was spelled out by Anatole Kaletsky, an editor and economic columnist at The Times of London. He wrote on August 18 that China’s rise is making the richest nations even richer. Along with pushing down global prices of mass-produced goods, China’s influence may actually be pushing up the prices of products and services China does not or cannot make. That can be seen in the prices of things that China consumes — oil, financial services, luxury goods and real estate. Kaletsky said that as prices of luxury goods and financial services are driven higher, prosperous countries with service industries become wealthier, compared with manufacturing countries.

题型:单项选择题

水平分型模具生产出的橡胶制品普遍存在()的缺陷。

题型:单项选择题

猎豹看到一群瞪羚,你觉得哪只瞪羚是它该偷袭的对象呢?()

A、瞪羚群中病怏怏的那只

B、瞪羚群中老歪歪了的那只

C、年轻健康且离开群体单独活动的那只

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