DDTs and HCHs serum level were detected by EC - ECD .运用GC -ECD 方法检测血清中有机氯农药DDTs和HCHs水平.In DDTs the residual level of p, p?DDTs中p, p?The residual levels of DDTs, HCHs in soil were different with different utilization type...
传记是一种记叙文.A biography is a form of narration.只是把细节拼凑起来并不能写出一篇好的记叙文.One cannot write a good narrative simply by piecing together the details.靠拼凑细节是不能写出一篇好记叙文的.One can't write a good narrative simply by piecing togethe...