How much material is available for the analysis, and what is the approximate concentration ot the compound of interest (the analyte)?
可用于分析的材料有多少？所感兴趣的化合物(分析物)的浓度大约是多少？
Serial taps comprise of one or more undersized roughing taps which remove most ot the material before final sizing with a finishing tap.
成套丝锥由一支或者更多在用精加工丝锥最终加工到尺寸之前移除大多数材料的较小尺寸的粗切丝锥组成。
Temperature contraction coefficient is a parameter for material expansion and contract property when temperature becomes high ot low.
温度收缩系数是反映材料热胀冷缩特性的参数，贫砼基层材料的温缩特性又直接影响到温度应力。
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