A.生育期縮短; B.產(chǎn)量降低; C.營養(yǎng)體不發(fā)達(dá); D.變化不大;
A.生物學(xué)產(chǎn)量; B.收獲指數(shù) C.經(jīng)濟(jì)學(xué)產(chǎn)量; D.經(jīng)濟(jì)指數(shù);
A.間作; B.單作; C.混作; D.套種;