土壤有机质平衡 soil organic matter balance
在农作制长期稳定不变的后期,土壤有机质的年积累量和年分解量相当,有机质含量保持的动平衡状态。
() are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.
() are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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