【判断题】需要系数是供电线路的计算负荷在所有设备功率总和中所占的比例,也可理解为建筑内所有电气设备同时工作的概率。
【单选题】E-R 模型向关系模型转换时,三个实体之间多对多的联系m:n:p 应该转换为一个独立的关系模式,且该关系模式的主键由____组成。
【单选题】The author thinks that harsh words are appropriate in the following situations EXCEPT
A.
when you see something unfair.
B.
when you are annoyed at someone's extremely foolish behavior.
C.
when you are enough with an arrogant person.
D.
when you are in disagreement with your colleagues.
【单选题】文学作品的“氛围”是整体文学形象(矛盾冲突、人物心情等)的( )。
【单选题】It can be inferred that the writer thinks that engineering curricula are
A.
strengthened when they include courses in design.
B.
weakened by the courses designed to develop mathematical skills.
C.
weak because they include some nonscientific components.
D.
strong despite the absence of nonscientific modes of thinking.
【简答题】Nina thinks that when
you live with a host family, you learn ___ .A. their language B. about their country
【多选题】带电的电压互感器二次回路上工作,应注意的安全事项是()。
D.
接临时负荷时,应装设专用隔离开关和可熔熔断器
【多选题】在带电的电压互感器二次回路上工作时,应采取()安全措施。
A.
严格防止短路或接地。应使用纪绝缘工具,戴手套。必要时,工作前申请停用有关保护装置、安全自动装置或自动化监控装置。
C.
工作时应有专人监护,严禁将回路的安全接地点断开.