This region is short of soil organic matter for the average value is less than 1%.
该地区土壤有机质含量均很低,平均还不到1%。
A germanium interferometer which may be used for measuring the dispersion curves of organic liquids in the spectral region of 2-11 microns is described.
本文叙述了一个锗制的红外干涉仪,它可供在2—11微米的红外区域内测定有机液体色散曲线之用。
As part of the organic components of Neolithic culture in this region, the Neolithic animal sculpture along the Yellow River Valley had its functions and contexts.
黄河流域的史前动物雕塑,作为这一地区史前文化的有机组成部分,有其自身的功能和内涵。
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