Results 61 to 70 of about 429 (93)

[Prevalence and influencing factors of scoliosis among primary and secondary school students in Hunan Province, 2023]. [PDF]

open access: yesZhong Nan Da Xue Xue Bao Yi Xue Ban
Zhou Y   +6 more
europepmc   +1 more source

利用高含沙洪水治沙淤地的土壤养分、粒径分布特征分析

open access: yesShuitu Baochi Xuebao, 2007
对公乌素引洪灌区风沙地(对照)、新淤地、淤后耕地的0~100cm剖面分层取样,进行土壤养分含量、土壤颗粒粒径组成的测定,以分析利用高含沙洪水淤地治沙后土壤养分、粒径的分布特征。结果表明,新淤地的速效磷含量是原状风沙土的4.2倍,速效钾的2.5倍,碱解氮的2.4倍,全氮的2.7倍,全磷的1.3倍,有机质的3.3倍,其中速效钾、速效磷含量分别达到了全国第二次土壤普查养分标准的极高、丰富等级。将高含沙洪水引人沙漠盆地,经过多年多次淤积,淤积层累计达到或超过耕作层厚度,可以将沙漠变成高质量的农田 ...
doaj  

Risk factors for multiple myeloma and its precursor diseases. [PDF]

open access: yesZhong Nan Da Xue Xue Bao Yi Xue Ban
Ma W, Zhao L, Zhou W.
europepmc   +1 more source

[Expert consensus on the diagnosis, treatment, and prevention of neonatal dengue, chikungunya, and Zika virus infections (2025)]. [PDF]

open access: yesZhongguo Dang Dai Er Ke Za Zhi
Perinatal Group   +2 more
europepmc   +1 more source

医脉传承百十载 踔厉奋发谱新篇. [PDF]

open access: yesZhong Nan Da Xue Xue Bao Yi Xue Ban
Chen X.
europepmc   +1 more source

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