参考咨询工作是图书馆工作的一个重要组成部分，也是深化读者服务的一种必要手段。
Consultant service is an important part in the library and also is the necessary means to deepen the service for the readers.
该法是确定合成聚醚硅油产品的反应程度和控制产品质量的一种必要手段，同时为调整聚醚硅油的性能提供了依据；
The method is very necessary for confirming the reaction extent and controlling product quality and adjusting polyether silicon oil characters.
道德控制是运用道德规范来维持社会秩序的一种必要的社会控制手段。
The morals controlling is a kind of means that keep social order by to use codes of ethic.
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