城市生活无着的流浪乞讨人员的救助管理办法
Measures for Assisting Vagrants and Beggars with No Means of Support in Cities
交流发电机产生的电压
alternator generated voltage
生产要素的流动性
circulation of product factor
血小板衍生的生长因子
platelet derived growth factor
Ni的流失与烧结
loss and sintering of nickel
包含直流的电磁暂态
electromagnetic transients including direct curren
amplitude modulation waveform