该配方及所有成分是无毒的.The composition and all its ingredients are nontoxic.昆虫取食了味纯和的 ( 无毒的 ) 饲料可能表现出它们真正的生物潜能.Insects fed on a bland ( nontoxic ) diet would show their real biotic potential.效果和症状: 大黄本身是无毒无害甚至是有益健康的.Effects and Sy...
介绍了一种在石油加工过程中产生的特殊副产物 - 硬沥青.The byproduct of petroleum industry - hard pitch andphysical and chemical properties are introduced.摘要介绍了一种在石油加工过程中产生的特殊副产物 - 硬沥青.The byproduct of petroleum industry - hard pitch is recommende...