density log密度测井densityn.密度；浓度；比重density-exposure curve密度曝光量曲线density specific impulse容积比冲density following device浓度跟随器density wave oscillations密度波型脉动density fimetional theory密度泛函理论density kernel estimation密度核估计density tunctional theory密度泛函density functional method密度泛函方法density of scanning lines扫描线密度density of magnetic field磁感密度