The key problems about the further research of the access control in CRN are proposed.

提出基于CRN的接入控制进一步研究的关键问题.

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CRN: What would you characterize as the fastest - growing part of your services business?

您如何描述贵公司服务业务中增长最快的部分?

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The concept of controlled - release nitrogen fertilizers ( CRN ) as a nitrogen management tool is not new.

用控释氮肥 ( RN ) 为氮素管理的一项措施已不是新概念.

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