XMM延伸存储器管理程序XXs或 X's,X级电影, 成人电影(十八岁以下儿童不得观看)Xylocopa collaris sauterin.领木蜂萨氏亚种X-band microwave source爱克斯波段微波源X field of an instruction指令的X字段X-ray photograph Bedside床旁摄影X -ray luggage screening空港安检Xship communication system舰船通信系统Xylo--Oligosaccharides低聚木糖X-band pulse transmitter爱克斯波段脉冲发射机X-ray diffraction system爱克斯射线衍射系统x-ray permeable backrest可透X射线靠背〔头颅摄影用检查椅〕