single e cross单交
single-cross seed单杂交种子
single roller cross单辊交叉
single-cross production单杂交生产
Single-cross combination单交组合
single-cross hybrid单杂交杂种
single-cross control单交叉控制
single-cross type program单交型计划
single-cross stitchellong machellone单横钉铆机