单词：composite sample
composite sample的用法和样例：
例句
- Composite samples are used mainly in evaluating the efficiency of waste-water treatment facilities.混合样主要用来评价废水处理装置的效率。
单词：composite sample 相关文章
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A: What is that plastic cup for? B: Your doctor has requested a urine sample. A: Am I supposed to pee into the cup? B: We want what we call a clean sample. Urinate a drop or so into the toilet, and then stop the flow and urinate into the cup. A: Then
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