问题 问答题 简答题

旋流布料型沼气池由哪几部分组成?

答案

参考答案:

旋流布料型沼气池由进料口、进料管、发酵间、贮气室、活动盖、水压间、酸化间、旋流布料墙、单向阀、抽渣管、抽渣间、活塞、导气管、出料通道等部分组成。

单项选择题

Friday marks the 40th anniversary of one of the biggest, most expensive, most destructive social policy experiments in American history: The war on drugs. On the morning of June 17, 1971, President Richard Nixon, speaking from the Briefing Room of the White House, declared: "America’s public enemy No. 1 in the United States is drug abuse. In order to fight and defeat this enemy, it is necessary to wage a new, all-out offensive. I have asked the Congress to provide the legislative authority and the funds to fuel this kind of an offensive. This will be a worldwide offensive dealing with the problems of sources of supply, as well as Americans who may be stationed abroad, wherever they are in the world. "

So began a war that has waxed and waned, ,sputtered and sprinted, until it became an unmitigated disaster, an abomination of justice and a self-perpetuating, trillion-dollar economy of wasted human capital, ruined lives and decimated communities. Since 1971, more than 40 million arrests have been conducted for drug-related offenses. And no group has been more targeted and suffered more damage than the black community. As the American Civil Liberties Union pointed out last week, "The racial disparities are staggering: despite the fact that whites engage in drug offenses at a higher rate than African-Americans, African-Americans are incarcerated for drug offenses at a rate that is: 10 times greater than that of whites. "

An effort meant to save us from a form of moral decay became its own insidious brand of moral perversion-turning people who should have been patients into prisoners, criminalizing victimless behavior, targeting those whose first offense was entering the world wrapped in the wrong skin. It feeds our overwhelming thirst for punishment.

Last week, the Report of the Global Commission on Drug Policy, a 19-member commission that included Kofi Annan, a former U. N. secretary general, declared that: "The global war on drugs has failed, with devastating consequences for individuals and societies around the world. Fifty years after the initiation of the U.N. Single Convention on Narcotic Drugs, and 40 years after President Nixon launched the U. S. government’s war on drugs, fundamental reforms in national and global drug control policies are urgently needed. "

The White House immediately shot back: no dice. The Obama administration presented a collection of statistics that compared current drug use and demand with the peak of the late 1970s, although a direct correlation between those declines and the drug war are highly debatable. In doing so, it completely sidestepped the human, economic and societal toll of the mass imprisonment of millions of Americans, many for simple possession.

No need to put a human face on 40 years of folly when you can wrap up its inefficacy in a patchwork quilt of self-serving statistics.

Kofi Annan()

A. proclaimed an end to the global war on drug trafficking

B. called on the U.N. to reassess the consequences of the war on drugs

C. accused President Nixon of mis-targeting his war on drugs

D. called for a change in national and global drug-related policies

填空题

(15分)

沿海地区有着丰富的海水资源,海水占地球总储水量的97.4﹪,海水是人类宝贵的自然资源,若把海水淡化和化工生产结合起来,既可以解决淡水资源缺乏的问题,又可以充分利用海水资源,从海水中可以提取多种化工原料,下图是某工厂对海水资源综合利用的示意图:

⑴请列举海水淡化的两种方法                                         

⑵使用离子交换树脂与水中的离子进行交换也是常用的水处理技术。聚丙烯酸钠是一种离子交换树脂,写出聚丙烯酸钠单体的结构简式             

⑶步骤Ⅰ中已获得Br2,步骤Ⅱ中又将Br2还原为Br -,其目的是:            

步骤Ⅱ用SO2水溶液吸收Br2,吸收率可达95%,有关反应的离子方程式

                                                         

⑷在制取无水氯化镁时需要在干躁的HCl气流中加热MgCl2.6H2O的原因

                                                                     

⑸电解无水氯化镁所得的镁蒸气在特定的环境里冷却后即为固体镁,下列物质中可以用做镁蒸气的冷却剂的是

A.H2

B.CO2

C.空气

D.O2 E.水蒸气⑹苦卤(海水蒸发结晶分离出食盐后的母液)中含有较多的NaCl、MgCl2、KCl、MgSO4等物质.用沉淀法测定苦卤中MgCl2的含量(g/L),测定过程中应获取的数据有