marginal production cost
marginal production rate
household production theory
multiple-production theory
production expansion and energy conservation
production expansion colony
production expansion revamping
the three-production theory
Cavity Expansion Theory
防水帷幕
扩孔理论
空穴膨胀论
孔扩张理论
圆孔扩张理论
空穴膨胀理论
空腔膨胀理论
cavity-expansion theory
column expansion theory
cylindrical cavity expansion theory
cylindrical hole expansion theory
expansion theory
扩张说
原生中心柱中心变化而成髓之说
膨胀说
热胀说
扩张理论