unsown地里没有撒播的unsadj.不对称的unspecified bits assignment不确定位填充unswappable password system不可交换的密码体制unstationary random process非平稳随机过程unsaturated carboxylic acid不饱和羧酸unsaturated expansive soils非饱和膨胀土unscientific administration非科学化管理行为unsinkable aircraft carrier不沈航空母舰unsymmetrical multivibrator不对称多谐振荡器Unscaless range calculation无标度区计算unsymmetrical reinforcement非对称配筋