【简答题】如果将额定频率为60Hz的变压器,接到的50Hz电网上运行,那么主磁通会 ,励磁电流会 ,铁耗会 。(填:减小、不变或增大)
【简答题】2×5= 4.2-1.8= 12.5×8= 3.54×10= 5.2+0.8= 2.15+1.85= 0÷0.25= 2÷0.4= 9÷6= 70×50=
【简答题】2×5= 4.2-1.8= 12.5×8= 3.54×10= 70×50= 2.15+1.85= 0÷0.25= 2÷0.4= 9÷6= 7x-2.8x=
【简答题】2-1.8= 12.5×8= 3.54×10= 5.2+0.8= 2.15+1.85= 0÷0.25= 70×50= 81.6÷1000=
【单选题】Part I Listening Comprehension Section A Directions: This section is to test your ability to understand short dialogues