Sewage Sludge on the Contents of Organic Matter, Total n, Total P, and Total K in Calcareous ImmatureSoil and Calcareous Mellow Soil.
通过盆栽试验研究了不同用量污泥对石灰性生土和熟土有机质和全氮、全磷、全钾含量的影响。
2
The pile-plank structure is a new-type structure of ballastless truck on soil subgrade, and the design and calculation of the pile-plank structure are still immature.
桩板结构路基是土质路基上无碴轨道的一种新型结构形式，其设计及计算还不成熟。
3
From a global perspective, immature commodity economy and regulated market environment for the survival of commercial bribery soil.