单项选择题
A.能提高蔬菜的产量B.能促进枝条生根C.能促进果实脱落D.能促进种子休眠
A.花萼B.子房C.花药D.花丝
A.终年多次发情B.终年发情C.季节性发情D.频繁性发情
A.茎B.叶C.花D.果实
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