废旧印刷电路板的回收利用可实现资源再生,并减少污染。废旧印刷电路板经粉碎分离,能

题型:填空题

问题:

废旧印刷电路板的回收利用可实现资源再生,并减少污染。废旧印刷电路板经粉碎分离,能得到非金属粉末和金属粉末。

(1)下列处理印刷电路板非金属粉末的方法中,不符合环境保护理念的是______________。

A.热裂解形成燃油 B.露天焚烧 C.作为有机复合建筑材料的原料 D.直接填埋

(2)用H2O2和H2SO4的混合溶液可溶出印刷电路板金属粉末中的铜。已知:

Cu(s)+2H+(aq)=Cu2+(aq)+H2(g) △H=64.39kJ·mol-1

2H2O2(l)=2H2O(l)+O2(g) △H=-196.46kJ·mol-1

H2(g)+1/2O2(g)=H2O(l) △H=-285.84kJ·mol-1

在H2SO4溶液中Cu与H2O2反应生成Cu2+和H2O的热化学方程式为_______________________。

(3)控制其他条件相同,印刷电路板的金属粉末用10℅H2O2和3.0mol·L-1 H2SO4的混合溶液处理,测得不同温度下铜的平均溶解速率(见下表)。

当温度高于40℃时,铜的平均溶解速率随着反应温度升高而下降,其主要原因是________________________________________________________________。

(4)在提纯后的CuSO4溶液中加入一定量的Na2SO3和NaCl溶液,加热,生成CuCl沉淀。制备CuCl的离子方程式是____________________________。

考点:影响化学反应速率的因素铜盐(二价铜)盖斯定律垃圾资源处理
题型:填空题

牙防指导组派出一专家小组到某氟牙症流行地区调查流行状况及其影响因素。根据研究计划,他们进行了以下工作

饮水氟含量适宜浓度为()

A.0.2~0.6ppmF

B.0.7~1.OppmF

C.1.0~1.5ppmF

D.1.5~2.0ppmF

E.2~2.5ppmF

题型:填空题

帕金森病功能评定的内容主要包括 ()

A.肌力

B.肌张力

C.协调功能

D.步态分析

E.日常生活活动能力

题型:填空题

阅读理解。

     Let children learn to judge their own work. A child learning to talk does not learn by being corrected

all the time; if corrected too much, he will stop talking. He notices a thousand times a day the difference

between the language he uses and the language those around him use. Bit by bit, he makes the necessary

changes to make his language like other people's. In the same way, children learn to do all the other things without being taught to walk, run, climb, whistle, ride a bicycle…They compare their own performances

with those of more skilled people, and slowly make the needed changes. But in school we never give a

child a chance to find out his mistakes and correct them for himself. We do it all for him. We act as if we

thought that he would never notice a mistake unless it was pointed out to him, or correct it unless he was

made to. Let him work out, with the help of other children if he wants it, what this word says, what the

answer is to that problem, whether this is a good way of saying or doing this or not.

     If it is a matter in mathematics or science, give him the answer book. Let him correct his own papers. Why should we teachers waste time in such routine work? Our job should be to help the child when he

tells us that he can't find the way to get the right answer. Let the children learn what all educated persons

must some day learn, how to measure their own understanding, how to know what he does not know.

1.According to the passage, the best way for children to learn things is by ________.

A.listening to skilled people's advice

B.asking older people many questions

C.making mistakes and having them corrected

D.doing what other people do

2.Which of the following does the writer think teachers should NOT do?

A.Give children correct answers.

B.Allow children to mark mistakes.

C.Point out children's mistakes to them.

D.Let children mark their own work.

3.According to the writer, teachers in school should ________.

A.allow children to learn from each other

B.point out children's mistakes whenever they are found

C.correct children's mistakes as soon as possible

D.give children more book knowledge

4.The passage suggests that learning to speak and learning to ride a bicycle are ________.

A.different from learning other skills

B.the same as learning skills

C.more important than other skills

D.not really important skills

题型:填空题

下列不是肠易激综合征(IBS)的临床表现的是()

A.消瘦

B.腹痛

C.腹泻

D.便秘

E.失眠

题型:填空题

下述不是Ⅱ型呼吸衰竭的特点的是()

A.动脉血二氧化碳分压>55mmHg

B.动脉血氧分压<50mmHg

C.常见于慢性阻塞性肺疾病

D.有效肺泡通气量增加

E.主要是呼出CO2障碍所致,是一种通气衰竭

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