excopy目录与文件复制命令,外部拷贝EXCn.开挖(激励器；排气关闭)excentric sleeve偏心轴套exciton spectrum激子光谱excfess electron过剩电子excursive adj.离题的；excimer emission受激发射excreta disposal粪便处理excitoinhibitory兴奋抑制的excentric embryo偏位胚excistoglandular兴奋腺体的excluding pre.以外