collision theory hard sphere theory
hard sphere theory collision theory
lipoid-sieve theory lipoid-filter theory
TRIZ theory of inventive problem solving theory
TRIZ发明问题解决理论理论
TRIZ理论发明问题解决理论
electrostatic hertz wave
(pressure)gauge with electric contact
3D contact finite element method
3-D contact model
三维接触模型
受艾滋病影响儿童
受艾滋病影响儿童(OVC)