Xx
X experiment实验
X experiment试验
X all-weather route全天候路线［代字］
X reactor反应堆［代字］
X/L crosslink交联［代字］
XAAM experimental air-to-air missile实验空空导弹
XAC Xi'an Aeroplane Company西安飞机工业公司
XAE merchant ammunition ship军火商船［代字］
XAK merchant cargo ship运输商船［代字］
XAKC merchant coastal cargo ship海岸运输商船［代字］
XAM merchant ship converted to minesweeper由商船改成的扫雷艇［代字］
XAP merchant transport运输商船［代字］
XAPc merchant coastal transport，small小型海岸运输商船［代字］
XAS X-band antenna system X波段天线系统
Xber December十二月
XBR X-band radar X波段雷达
XC experimental cargo aircraft实验运输飞机［代字］
XCRV experimental crew return rehicle实验型乘员返回飞行器
XDC control center for Nike-X system“奈基-X”导弹系统控制中心［代字］
XDS exoatmospheric defense system外大气层防御体系
Xe xenon 氙［第54号化学元素］
XF experimental fighter实验战斗机
XFLOT cross forward line of own troops己方部队交叉前沿阵地线
XH experimental helicopter实验直升机
X-hour effective beginning time of an exercise演习实际开始时间［代字］
XIDB extended integrated database扩充（型）综合数据库(https://www.daowen.com)
XLUUV extra large unmanned underwater vehicle超大无人潜航器
XM experimental missile实验导弹
XM research missile科研导弹［代字］
X-MIL extra military expense额外军事费用
XML extensible markup language可扩展标记语言
XO executive officer副指挥官
XoDis exoatmospberic discrimination外大气层识别
XOS experimental operating system实验型操作系统
xpl explosive爆炸的
xpl explosive炸药
xplo explosion爆炸
XRL Extended Range Lance增程“长矛”导弹
XS-1 experiment sky-1实验性太空飞机
XSA X-band satellite antenna X波段卫星天线
XSAM experimental surface-to-air missile实验地［海］对空导弹
XSM experimental strategic missile实验型战略导弹
XSPV experimental solid propellant vehicle实验固体推进运载器
XSS experimental space station实验型空间站
XSSM experimental surface-to-surface missile地对地实验导弹
XSSM supersonic surface-to-surface missile超音速反舰导弹
XST experiment stealthy target实验隐身目标
XUV experimental unmanned vehicle实验无人车
XVIII ABC XVIII Airborne Corps第十八空降军
XW experimental warhead实验型弹头
XWS experimental weapon system实验型武器系统