题型：选择题 读句子，选择对应的图片。( ) 1. He is a doctor.A. ( ) 2. She is an accountant.B. ( ) 3. She is a salesperson.C. ( ) 4. He is a teacher.D. ( ) 5. He is an artist.E. ( ) 6. He is a policeman.F. ( ) 7. She is a cleaner.G. ( ) 8. He is an engineer.H. 查看答案
题型：单项选择题 案例分析题 某厂有一台额定容量为5000kVA的电力变压器，其空载损耗为6．75kW，短路损耗为36．7kW，阻抗电压为7％，空载电流百分率为0．9％，变压器负载率为73％。计算其功率损耗。该变压器二次输出功率为（）。A.5400kWB.4680kWC.3651kWD.3510kW 查看答案
