从下列单词中选出你所听到的单词或词组,并按顺序将其写入对应题号中 electronics 2. electronic 3.century 4.invention 5.vacuum tube 6.record player 7. tape recorder 8. transistor 9. portable 10. microelectronics 11. introduction 12. development 13. integrated circuit 14.silicon chip 15. microprocessor 16.household 17.automatic 18.washing-machine 19.dishwasher 20. timer 21.timer 22. microwave 23. multimedia 24.electricity 25.experimental 26cell 27 principle discount