春播作物优良品种介绍
Introduction of Spring Crops Good Varieties
间作作物竞争力
Aggressivity of intercropped crop
Competitiveness of intercropped crops
N人非合作条件博弈
N-person non-cooperative condition game
Skinner操作条件反射
Skinner’s operant conditioning
半悬挂机引条播机
semi-mounted tractor drill