XBM黑白位图文件格式。XXs或 X's,X级电影, 成人电影(十八岁以下儿童不得观看)X-Ray Multi-Mirror Observatory多镜面X射线观测卫星(欧洲)Xylenol orange modified silica gel二甲酚橙键合硅胶X-ray photoelectric separation X光光电选矿机X-ray spectrochemical analysis X射线光谱分析X-ray photoelectron spectroscopy爱克斯射线光电子光谱学X-ray fluorescent spectrometry X射线荧光光谱测定法X-band travelling wave amplifier爱克斯波段行波放大器x-ray television macrofluorscope电视X线放大透视x-ray tube with beryllium window铍窗X线管XSAR eXtra Storage Address Register额外存储体地址寄存器