As for drilling mud but made up with 35 ppb Bentonite to 100 + vis.
对钻井液,按每桶35磅比例加入膨润土,使粘度达到100秒.
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Of these bands, 114 were polymorphic, and the percentage of polymorphic bands ( PPB ) was 95.00 %.
其中,多态性谱带114条,多态性带百分率 ( PPB ) 为95.00%.
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It'shows that 0.2 ppb of Ag + can be quantitatively absorbed from aqueous solution sample.
水样中0.2ppbAg~+可定量被吸附.
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Sulfinert coating provides stable storage of sulfur and mercury at ppb levels in petroleum samples.
硫钝化的涂层为采样罐提供了稳定的性能,可以储存PPB级的含硫样品.
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DON amounts of various components were in the range of 2900～18670 ppb during milling process.
制粉过程各组分DON含量在2900～18670ppb之间.
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在距离该机面板50cm处，负离子浓度大于250万个/cm~3，臭氧浓度小于1ppb；
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通过与GenBank+EMBL+DDBJ+PDB中的455972个序列进行同源性比较，同源性均小于30%，表明该片段为一新发现的序列。
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