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...
混凝土由水泥 、 砂、石子与水掺和而构成.Concrete is composed of cement, sand and gravel mixed with water.两种液体在掺和器里均匀了一下.The two liquids homogenised in the blender.两种液体在掺和器里均匀了一下。The two liquids homogenized in the blender....