所有这些功能，该泵的弹性膜片促进高效率，并提供无任何污染取样气体的风险的无油操作。
Among features, the pump's elastomeric diaphragm promotes high efficiency and delivers oil-free operation without any risk of contaminating the sampled gas.
直接取样的好处是可以评估难以清洗和相当容易接近的区域，使得可确定每个给出的表面区域的污染物或残留物的级别。
Advantages sof direct sampling are that areas hardest to clean and which are reasonably accessible can be evaluated, leading to establishing a level of contamination or residue per given surface area.
通过钻探取样对一个垃圾场底部土层的污染状况进行了现场调查。
Investigation of pollution situation of bottom layer of a landfill by boring sampling was carried out.
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