Biosafety protect and importances of exhaust system in biosafety laboratories were presented.
介绍了生物安全实验室的安全防护及排风系统的重要性。
2
Statistical analysis shows that the economical importances of lactation, beef and secondary traits in this population are in the proportion of 2 : 1 : 2.
经统计分析表明，北京奶牛群的乳用、肉用和次级性状经济重要性之比为2：1：2。
3
This article discusses the functions , the shopping skills , the importances for foreign education and the construction about multimedia digital language laboratory.