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【单选题】
The word conservation has a thrifty meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment. Our forefathers had no idea that human population would increase faster than the supplies of raw materials; most of them, even until very recently, had the foolish idea that the treasures were 'limitless' and 'inexhaustible'. Most of the citizens of earlier generations knew little or nothing about the complicated and delicate system that runs all through nature, and which means that, as in a living body, an unhealthy condition of one part will sooner or later be harmful to all the others. Fifty years ago nature study was not part of the school work; scientific forestry was a new idea; timber was still cheap because it could be brought in any quantity from distant woodlands; soil destruction and river floods were not national problems; nobody had yet studied long-term climatic cycles in relation to proper land use; even the word 'conservation' had nothing of the meaning that it has for us today. For live sake of ourselves and those who will come after us, we must now set about repairing the mistakes of our forefathers. Conservation should, therefore, be made a part of everyone's daily life. To know about the water table in the ground is just as important to us as a knowledge of the basic arithmetic formulas. We need to know why all watersheds need the protection of plant life and why the running current of streams and rivers must be made to yield their full benefit to the soil before they finally escape to the sea. We need to be taught the duty of planting trees as well as of cutting them. We need to know the importance of big, mature trees, because living space for most of man's fellow creatures on this planet is figured not only in square measure of surface but also in cubic volume above the earth. In brief, it should be our goal to restore as much of the original beauty of nature as we can. The author's attitude towards the current situation in the exploitation of natural resources is______.
A.
positive
B.
neutral
C.
suspicious
D.
critical
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A.
施密特触发器
B.
单稳态触发器
C.
多谐振荡器
D.
主从JK触发器
【单选题】只有暂稳态的电路是()。
A.
多谐振荡器
B.
单稳电路
C.
施密特触发器
D.
定时器
【单选题】只有暂稳态的电路是 。
A.
多谐振荡器
B.
单稳态电路
C.
施密特触发器
D.
定时器
【单选题】只有暂稳态的电路是( )。
A.
多谐振荡器
B.
单稳态触发器
C.
施密特触发器
D.
定时器
【单选题】What is not Kirk ’ s suggestion for people who are already unhealthy to lose weight?
A.
Healthy eating is a good place to start .
B.
A good mood is good medicine.
C.
Daily exercise can contribute a lot.
【单选题】对于反刍动物来说,( )是消化碳水化合物的主要场所。
A.
瘤胃
B.
网胃
C.
瓣胃
D.
皱胃
【简答题】数字电路中只有一个稳态和一个暂稳态的电路是_________触发器。
【单选题】只有暂稳态的电路是( )。
A.
单稳态触发器
B.
多谐振荡器
C.
施密特触发器
D.
定时器
【多选题】冷疗法对周围血管的作用有
A.
皮肤发红
B.
皮温升高
C.
皮肤发绀
D.
皮温降低
E.
小静脉及毛细血管扩张
【单选题】,患者甲,70岁,男,因“急性心肌梗死”收治入院,主班护士易某的做法错误的是
A.
暂留陪送人员
B.
将患者安置在“危重病房”
C.
给患者吸氧
D.
为患者进行沐浴更衣
E.
建立静脉通路
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