RESULTS:False Houpurunnan have transverse skin holes and no oiltrace was found.
结果:伪品薄叶润楠可见横向皮孔多突起,油痕不明显。
2
Objective:To determine the contents of trace elements in hogwash oil.
目的:测定地沟油中的微量元素含量。
3
Carbon dioxide is a species of weak acidic gas, it is a erodent in oil and gas industries, its content in natural gas may vary from trace to more than 50%.