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The composition and diversity of natural regeneration of tree species in gaps under different intens
The positive ecological interaction between gap formation and natural regeneration has been examined but little research......
Removal of chromium (Ⅵ) dissolved in water by intermittent foam separation was implemented with cetyl trimethy-ammonium......
目的 观察危重症患者接受肠内营养治疗的最佳输注方式,减轻反流、误吸风险.方法 将60例ICUEN患者随机分为对照组和观察组各30例.对......