A method for analysis n-alkanes, steranes and terpanes in oil by internal standard method was established.
采用内标法建立了原油中正构烷烃、生物标志物(甾、萜烷类)的分析方法。
It is showed from vector analysis: N, P and K are deficient in poplar unfertilized and they are limiting factors to poplar.
矢量法营养诊断结果表明：未施肥的杨树各组织N、P、K均为缺乏状态，N、P、K是杨树生长的限制性因素。
It is showed from vector analysis: N, P and K are deficient in poplar unfertilized and they are limiting factors to poplar.
矢量法营养诊断结果表明：未施肥的杨树各组织N、P、K均为缺乏状态，N、P、K是杨树生长的限制性因素。
应用推荐