density function gradient materials [機械工程]密度功能梯度材料density function [數(shù)][統(tǒng)計] 密度函數(shù)density floppy disk drive [動力與電氣工程]單面雙密度軟盤機density field 密度場density distribution [統(tǒng)計][數(shù)] 密度分布density defect [材料科學]密度缺點density current [水利] 異重流；[海洋] 密度流density bottle method 比重瓶法density bottle [物] 密度測定瓶density biased sampling [計算機科學技術(shù)]密度偏差抽樣density (n.) density n.密度；濃度；比重densitometry n.密度測定法(顯象測密術(shù)；測光密度術(shù))densitometer n.光密度計；比重計；密度計densities of camping site [地球科學]營地密度densities n.密度；濃度；比重densimetric n.比重計；密度計densimeter (n.) densimeter n.比重計；密度計densilog n.密度測井