A.選育和引進新品種B.區(qū)域試驗,生產(chǎn)示范C.品種審定;良種繁育、加工D.檢疫、檢驗;經(jīng)營推廣
A.根B.莖C.葉D.花
A.28~30dB.30~32dC.32~34dD.34~36d