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The optimal rotation time, T, requires the forester to equate the of waiting to the of

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Individual landowners’ unique forestry costs or revenues do not affect what they can receive for the

The biggest inputs in forestry are labor and management.

如何评价当代西方国家公共部门改革？

逻辑“与”的基本作用是检索范围，命中文献量，提高检索结果的__。