分布式电源并网逆变器应具备(),在频率电压异常时自动脱离系统的功能。
A.过压保护
B.过流保护
C.短路保护
D.孤岛检测
参考答案:B, C, D
Object-oriented analysis(OOA)is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is (71) . It determines how the various results are computed by the product and presents this information in the form of a (72) and associated scenarios. The second is (73) ,which determines the classes and their attributes. Then determine the interrelationships and interaction among the classes. The last step is (74) , which determines the actions performed by or to each class or subclass and presents this information in the form of (75) .
75()
A.activity diagram
B.component diagram
C.sequence diagram
D.state diagram
()是运用块状色彩进行眼影造型及技法表现的方法。
A.质感肌理表现法
B.位置强调法
C.彩绘法
D.纹样表现法