变压器差动保护的关键问题是不平衡电流大，而且不能完全消除。因此在实现此类保护时必须采取措施躲开不平衡电流的影响。
参考答案：对
北京位于东北平原的南部边缘，背靠群山，面向渤海。[ ]
The communication management plan determines the information and communications needs of the stakeholders. In the following statements related to communication management plan. ( ) is false.
A. The communication management plan is contained in or is a subsidiary plan of, the project management plan.
B. The communication management plan can be formal or informal, highly detailed or broadly framed, and based on the needs of the project.
C. The communication manamgement plan organize and summarize the information gathered,and present the results of any analysis as comparedthe performance measurement baseline.
D. The communication management plan can include guidelines project status meetings,project team meetings,e-meetines,and e-mail
