oil spray trace indicating device 油液航迹显示器
Trace Oil 微量油
Reduce gesation trace essence oil 祛妊娠纹精油
trace oil treatment 微量油处理
Oil-gas source trace 油气源追踪
trace inhibited oil 含微量抗氧化添加剂油
trace oil in mine drainage 矿井水微量油
RESULTS:False Houpurunnan have transverse skin holes and no oil trace was found.
结果：伪品薄叶润楠可见横向皮孔多突起，油痕不明显。
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。
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%.
二氧化碳是一种弱酸性气体，它在石油及气体工业中是一种腐蚀剂，它在天然气中的含量少则痕迹，至50%以上。
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