下面()不能降低吸收过程阻力。A、改变相平衡关系,降低吸收剂温度、提高操作压强。 B

题型:单项选择题

问题:

下面()不能降低吸收过程阻力。

A、改变相平衡关系,降低吸收剂温度、提高操作压强。

B、改变操作条件对液膜控制的影响,增大液速和湍动。

C、改变操作条件对气膜控制的影响,增大气速和增强气相湍动。

D、开发和采用新型填料,使填料的比表面积增加。

考点:天然气净化操作工考试天然气净化操作工中级天然气净化操作工中级题库
题型:单项选择题

资料分析:

资料1 中国1790年人口约3亿,1860年约4亿,1970年8亿,2000年就超过13亿了.随着人口的增加和增长速度的加快,就必须扩大耕地面积,满足吃饭的需求,这样就对自然生态系统及生存其中的生物物种产生了最直接的威胁,这也是我国境内水土流失面积加快与沙漠化不断扩大的一个原因.

资料2 生态系统在自然或人为干扰下偏离自然状态,生境破碎,生物失去了家园.1995年时,有人曾经对造成生态系统退化和生物多样性减少的人类活动进行了排序:过度开发占35%,毁林占30%,农业活动占28%,过度收获薪材占6%,生物工业占1%.其中前三项人类活动占93%,而这些破坏最直观的结果是造成了物种生境的破碎化,栖息地环境的岛屿化.

资料3 随着人类的发展,环境污染也在加剧.仅以安徽省为例,1992年安徽省废水排放总量13.099 3亿吨,2002年废水排放总量为14.28亿吨,相比增加有1.180 7亿吨;1992年,安徽省工业固体废物产生量为2 523万吨,而2002年全省工业固体废物产生量3 414.69万吨,相比增加891.69万吨.由于排污量的不断上升,近年来污染事故发生率也在上升,仅用2001年与2002年相比,2001年安徽省共发生环境污染事故53起,其中水污染事故40起,大气污染事故11起.而2002年,安徽省环境污染与破坏事故58起,比上年增加5起,造成直接经济损失252.9万元,农作物受害面积184.6公顷,污染鱼塘面积31.6公顷.

(1)根据资料,请你分析生物多样性面临威胁的原因主要在哪几方面?

(2)针对我国现有状况,你能提出哪些建议?

题型:单项选择题

在保护我国的生物多样性方面,作为一名公民应当怎样做?

题型:单项选择题

衬砌内鼓变形和向内位移,当背后围岩坚固良好时,采用()是有效的。

A、压浆加固

B、嵌补

C、钢拱架临时加固

D、锚杆加固

题型:单项选择题

阅读表达。

     China's giant panda habitat (栖息地) was included on the World Heritage List Wednesday at the 30th session

of the World Heritage Committee( WHC) in Vilnius, capital of Lithuania.

     Another Chinese site applying for inclusion, the ruins of the Shang Dynasty capital in Anyang, Henan

Province, is also due to be discussed by members.

     After deliberation, the 30th session of the WHC unanimously (一致性地) agreed to include the giant panda

habitat, making it the 35th Chinese site on the list. 

     "We greatly thank the Chinese Government for submitting (提交) such a good application to the WHC to

enrich tile World Heritage List," said the WHC.

     "We greatly thank the Chinese Government for its tremendous effort to protect such a precious site of

bio-diversity (生物多样性)."

     Wang Fengwu, a member of the Chinese delegation at the meeting, told Chinese reporters that the decision

would prompt effective protection of rare and endangered animals and plant species.

     The giant panda habitat of Sichuan Province covers a 9,510 square-kilometre area including the

world-renowned Wolong Nature Reserve, China has spent 20 years trying to get the area included _____,said

Wang, who is also deputy director general of the Department of Urban Development at the Ministry of

Construction.

      The application topped a list of 37 proposed new sites vying (竞争) for inclusion. The giant panda habitat is

home to at least 300 giant pandas and a variety of endangered flora (植物).

     The World Wildlife Fund's former China director James Harkness once said that the panda's territory

contained some of the most critical regions for bio-diversity conservation in the world.

1. What's the best title of the passage? ( Please answer within 10 words. )

________________________________________________________________________________________

2. Which sentence in the passage can be replaced by the following one?

   After much consideration, all the members of the 30th session of the WHC agreed to include the giant

   panda habitat as the 35th Chinese site on the World Heritage List.

________________________________________________________________________________________

3. Please fill in the blank in the 7th paragraph with proper words or phrases to complete the sentence.

   ( Please answer within 10 words. )

________________________________________________________________________________________

4. What benefits will the decision bring to China? ( Please answer within 30 words. )

________________________________________________________________________________________

5. Translate the underlined sentence in the passage into Chinese.

________________________________________________________________________________________

题型:单项选择题

"皮肤咖啡牛奶色斑"可见于()

A.玫瑰糠疹

B.神经纤维瘤病

C.恶性黑素瘤

D.太田痣

E.皮内痣

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