Roles of catalysts on the aeration, hardness and deformation of polyether type PU soft foam were studied.
模拟冬夏季节环境 ,考察了不同催化剂对聚醚型聚氨酯软质泡沫通气性、硬度和压缩变形的影响。
cv Lushu7 and Xushu18 as materials,the effect of the soil aeration on mineral nutrition absorption, 14 C assimilates distribution in storage roots and storage root yield were studied.
选用鲁薯 7号和徐薯 1 8为材料 ,研究了土壤通气性对甘薯无机养分吸收、14 C 同化物分配和块根产量的影响。
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