A.補(bǔ)償點(diǎn)高 B.補(bǔ)償點(diǎn)一般 C.補(bǔ)償點(diǎn)低 D.無(wú)補(bǔ)償
A.麥穗 B.籽粒 C.主莖 D.葉
A.9~12 B.12~19 C.13~18 D.18~20