CD：变更指令

“Change Directive”在技术文档和项目管理中常被简称为“CD”，这一缩写形式便于快速书写和高效沟通。该术语在美国航空航天局（NASA）等专业机构的应用尤为广泛，其中文对应含义为“变更指令”，主要用于指示项目流程或技术规范的调整与更新。

In order to boost up guidance effect, at present, news media should mainly improve guidance methods from following aspects : change directive modus, boost up guidance in servings;
为了不断增强指导效果，新闻媒体当前主要应从以下几方面改进指导方法：改变指挥命令的做法，在服务中增强指导性；
Histological change has much directive significance than cell change to diagnosis of acute leukemia.
组织结构变化比细胞形态变化对白血病的诊断更有指导意义。
In addition, part of liver occurred necrosis and formed the focal cellular necrosis focus. The pathological change was an important directive change of PRV infection.
此外，肝脏的部分组织坏死形成局灶性的坏死灶，该病变是PRV感染的一个重要的示病病变。
In view of the poor quality of coal and the incertitude of the change of the AGC load directive, this thesis analyzed the spot of excessive temperature during the process of operating boiler for SG420t / h and summed up the measures of the solution.
鉴于当前入炉煤种品质差、AGC负荷指令变化的不确定性，对SG420t/h锅炉正常运行中易超温点进行分析，并对采取的措施进行总结。
Conclusion : The change of activities of CaN in resistant vessel is not the directive reason for saline hypertension.
结论：阻力血管平滑肌的CaN酶活性变化并非导致盐性高血压的直接原因。

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