The at least one barrier layer comprises a first polymer composition comprising a polymer matrix and a low molecular weight additive.
至少一个阻隔层 含有第一聚合物组合物，该组合物含有聚合物基质和低分子量添加剂。
The total root number, the fresh root weight, the dry root weight were mainly controlled by the additive effect, and had higher stable heritabilities.
根系性状中的根鲜重、根干重、根总条数等性状的遗传以加性为主，遗传力高，能稳定遗传，其转育及早代选择有效；
The results of test showed that the additive had a remarkable effect on gaining weight and preventing illness as well as enhancing illness-resistance of piglet.
试验表明这种添加剂对仔猪增重和防病治病具有明显的效果。
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