In order to improve the quality of seedlings and economic benefits,rare--earth experiments were carried out on eleven se......

Jojoba is a desert shrub,introduced in the marginal areas of Kenya during 1980s.Jojoba domestication is being faced by b......

在韧皮部运输，原形质的活动是否参予长在筛元素同伴房间 complcx hils 帮助树液流动，在争论。prcsent 调查 assumcd 微细丝(MF ) 和......

<正> 汞是城市污水中的一种主要有毒物,郊区农民常用这种污水灌溉农作物,造成减产。含汞工业污水对水稻、小麦种子萌发、幼苗及胚......