更多“树木的成活与生长调查最适宜时期为（）”相关的问题
《节约能源法》中规定：任何单位和个人都应当履行节能义务，有权检举（）的行为。
A.浪费能源
B.贪污
C.受贿
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活塞式压缩机检修项目中，属于小修项目的是（）。
A.检查各进、排气阀座，阀片，升程限制器，弹簧等
B.检查检验安全阀、压力表
C.检查活塞环磨损
D.检查气缸内壁磨损
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中学化学知识的结构具有（）。
A.逻辑性和教育性
B.教育性和发展性
C.发展性和系统性
D.系统性和层次性
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下列不需要根据职工提供服务的受益对象来划分，而应于发生时直接计入企业管理费用的是（）。
A . 工会经费
B . 养老保险费
C . 工伤保险费
D . 辞退福利
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乙炔发生器或回火防止器内的水冻结时，应用明火烘烤使其熔化。
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According to the author, where does the happiness of scientists lie
A．It lies in a sense of fulfillment.B．It lies in their rich imagination.C．It lies in the increase of their knowledge.D．It lies in the opportunity to continue the search.
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建立在消费者对商品客观、全面认识的基础上，对所获得的商品信息经过分机析比较和深思熟虑以后而产生的购买动机叫做（）。
A.感情动机 B.理智动机 C.信任动机 D.信任动机
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Life on earth depends on water, and there is no substitute for it. The current assumption is that our basic needs for water-whether for drinking, agriculture, industry or the raising of fish-will always have to be met. Given that premise, there are two basic routes we can go: more equitable(平衡的) access to water or more drastic engineering solutions. Looking at the engineering solution first, a lot of my research concentrates on what happens to wetlands when you build dams in river basins, particularly in Africa. The ecology of such areas is almost entirely driven by the seasonal regime of the river—the pulse of the water. And the fact is that if you build a dam, you generally wreck the downstream ecology. In the past, such problems have been hidden by a lack of information. But in this century, governments will have no excuse for their ignorance. The engineers' ability to control water flows has created new kinds of unpredictability too. Dams in Africa have meant fewer fish, less grazing and less floodplain(泛滥平原) agriculture, none of which were anticipated. And their average economic life is assumed to be thirty years. Dams don't exist for ever, but what will replace them is not clear. The challenge for the next decade is to find new means of controlling water. Although GM technology will allow us to breed better dry-land crops, there is no market incentive for companies to develop crops suitable for the micro-climates of the Sahel and elsewhere in Africa. Who is going to pay for research on locally appropriate crops in the Third World? This brings us to the key issue in any discussion of water: money. To talk about a water crisis covers difficult problems such as poverty. In the next decade every household in Britain will have a water meter, and we will pay for what we use just as we do for gas or electricity. That can be resolved and a similar system will eventually be adopted across Europe and the US. But consider the problems of water supply in Mexico City or Delhi. If you're rich, you drink mineral water and may even have a swimming-pool—yet millions in such cities can't get safe drinking water. There is a coming water crisis which is one for the poor.The word 'premise'(Para. 1) probably means '______'.A．assumptionB．promiseC．needD．crisis
A.B.C.D.TheE.A．assumptionB．promiseC．need
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电源开关S5线束到了（）端子
A．针形B．O形C．叉形D．插簧
B．O形C．叉形D．插簧
C．叉形D．插簧
D．插簧
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室内卷材防水层铺贴的搭接缝位置距阴阳角应大于（）mm。
A . 200
B . 250
C . 300
D . 350
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下列关于空值(NULL值)叙述正确的是（ ）。A.空值等于空字符串 B.空值等同于数值0 ###SXB#
A.空值等于空字符串
B.空值等同于数值0
C.空值表示字段或变量还没有确定的值
D.Visual
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若多个被选中的单元格都有数据，则单击“合并及居中”按钮后，（）。
A．保留所有单元格的数据
B．保留左上角单元格的数据
C．保留右上角单元格的数据
D．清除所有单元格的数据
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