Based on consider hereinbefore, this dissertation discusses several aspects on the problem of the sustainable and optimum exploitation of groundwater resources as follows:①reviewed entirely the origin and evolvement of the concept "sustainable development", stated and commented the study status in queue on"sustainable development"around national and international range, thorough discussed the science connotation about the concept "sustainable development";②looked back and commented across-the aboard some furthest basic concept and proposition related to groundwater resources, put forward self opinions on a few existent mistake points of view and chaos understandings;③expatiated entirely on the content and meaning of the theory of changeable groundwater resources system, contrast with the traditional methods of groundwater resources calculation and evaluation, combined example to show the application of this theory;④thorough analyzed the difficult and complexity to forecast the groundwater resources, fully stated the traditional methods of groundwater resources forecasting, pointed out the characteristic and applying condition of these forecasting method, introduced the main ideas and methods of wavelet analysis developed recently, and the MATLAB software be known as the fifths era computer language, and its accessory wavelet analysis toolbox, applied these methods and tools to analyze the groundwater dynamic curve, adopted the B-J method and Morte-Carlo method, combined with the theory of changeable groundwater resources system, discussed the new view on the forecast of groundwater resources;⑤synthetically analyzed the characteristics and limitations of the present all kind of groundwater manage model, combined mathematical programming, mathematical statistics, random process and the theory of variation system of groundwater resources on the unite optimum attempter of surface water and groundwater, emphasized how to make the model more nicety, more simple, more practicality;⑥analyzed the inside condition and outside condition to assure the sustainable and optimum exploitation of groundwater resources, the inside conditions are the follows: correct resources idea, scientific methods of resources calculation and evaluation, credible forecast methods of resources, exercisable measures of resources management, the outside conditions are the follows: the development idea of high layer, the transform of manage system, the matched policy and rule of law, the adjusted of economy lever, the improve of cultural diathesis, the boosting up of water-saving consciousness and detail measures, the control of population rising, the prevention and cure of water pollute, the renew and rebuild of ecology;⑦scan the sustainable and optimum exploitation of groundwater resources from the high level of metagalaxy, earth system science, and philosophy;⑧point out the more directions on groundwater resources.

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The experiment of linear expansion coefficients of metals using micrometer caliper,in place of light lever is introduced,this makes experimental apparatus simpler,the operation easier,and reduces the unstable factor in experiment.

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As comparing with adopting traditional optical lever method to measure Young' s modulus of elasticity E.

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When the reel on the reel diameter capillary gradually increases, like turning round trip, using the lever principle, continuously variable belt tensioning force the initiative under the round rotating movable pulley disc produce axial movement of the work of change with diameter, pipeline so that the speed of reel hair always synchronized with the tractor forward speed.

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A lever is movably coupled with the connector.

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Lewis Mumford described the Lever House as "the first office building in which modern materials, modern construction, modern functions have been combined with a modern plan".

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The myofibril volume density in the groups of animal model and betaloc were lower in the lever than those of captopril and sham-operated groups.

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The neocolonialist "non-Asian" forces penetrated into Asia and established anti-communist alliance with some Asian countries, splitting Asia not only in terms of geographical politics but also seriously undermining the main "lever" that could unify Asia.

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