LUCY
发表于 2025-3-25 03:22:39
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cataract
发表于 2025-3-25 08:44:34
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epicondylitis
发表于 2025-3-25 13:15:31
Introductiontained no free oxygen, and that appreciable oxygen concentrations developed only because of the evolution of living organisms which, in turn, had to adapt themselves to the environmental changes caused by the oxygen.
敬礼
发表于 2025-3-25 17:21:53
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Decibel
发表于 2025-3-25 22:15:24
Impact of Land and Sea Pollution on the Chemical Stability of the Atmospheree which are essential for life and human welfare. The hydrosphere, in particular the ocean, is in dynamic equilibrium with the atmosphere and is largely responsible for controlling the chemical composition of the latter. The equilibrium processes are biogeochemical as well as physical in nature. An
Tractable
发表于 2025-3-26 01:49:27
The Global Balance of Carbon Monoxidebon monoxide is principally a man-made pollutant. Of the estimated 102 million tons of CO emitted in the U.S.A. during 1968 more than 90 × 10. tons were emitted from major technological sources. The motor vehicle contributed approximately 63% of the man-made CO emissions or about 58% of CO from all
懒惰民族
发表于 2025-3-26 05:43:47
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neuron
发表于 2025-3-26 11:50:33
Introductionoductive agriculture requires fertilizers, principally nitrogen and phosphorus. It is very susceptible to damage by various pests. It usually requires irrigation, which often involves a transfer of water, and a return flow which carries off nutrients, chlorides, pesticides — all undesirable substanc
保守
发表于 2025-3-26 14:15:27
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RAG
发表于 2025-3-26 17:36:39
The Dynamics of Nitrogen Transformations in the Soilquifers with nutrients, particularly nitrate, can be expected to become a serious and widespread problem. Already surface water supplies are showing the signs of excessive fertility while reports of high nitrate wells increase in frequency. Nitrogen compounds in surface waters often are associated w