PPB的例句大全

Calibrations showed good linear relationship between photon counts of PMT and concentration of ozone generated by standard ozone calibrator, up to 50 ppb ( parts per billion by volume).

采用标准臭氧发生器标定的结果显示，在0￣50×10-9（体积比）的浓度范围内，化学发光的光子计数值与臭氧浓度之间的线性关系很好。

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Studies of the determination of rare earth elements at ppb. level with ICP spectrometry

ppb级稀土元素分量等离子光谱测定的研究

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Objective To investigate whether the ventilative resistance of the eustachian tube ( VRET) changed with the atmospheric pressure, and whether barotrauma can be prevented by positive pressure breathing ( PPB) with exhalation pressure> VRET.

目的探讨咽鼓管通气阻力（VRET）是否随大气压变化而变化，并了解呼气压大于咽鼓管通气阻力的正压呼吸能否预防耳气压伤。

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determination of ppb level anions in sulfolane by ion chromatography with a novel column-switching injection system;

综述了离子色谱技术在气溶胶可溶性无机离子测定中的应用。

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The content of aflatoxin Bl in the contaminated fodder was rather high with an amount of 475 ppb.

饲料中黄曲霉素素B1含量相当高，达475ppb。

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Global atmospheric N2O concentration has increased from a pre-industrial value of about 270 ppb to 319 ppb in 2005.

大气中N2O浓度已从工业革命前的270ppb左右上升到2005年的319ppb。

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determination of zinc at ppb levels in high-purity gallium with flameless atomic absorption spectrometry

非火焰原子吸收光谱法测定超纯镓中ppb级锌

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Previous analytical methods such as conventional ICP MS and INAA usually give low analytical precision of> 15 to 100% for sub ppb to ppt level rock samples.

以往的分析方法（如常规的ICP-MS和中子活化分析方法），对含10-9～10-12级低含量铂族元素的岩石样品分析精度一般较差（>15%～100%）。

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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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Add 25 ppb Bentonite and allow to hydrate for a minimum of 6 hrs.

按每桶钻井液加25磅的膨润土,允许水化至少6个小时.

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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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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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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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/ cm3 while that of O3 components is less than 1 ppb at the distance of 50 cm from the panel of the instrument.

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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Comparison between MOPB04_ 600 and 455,972 sequences from GenBank+ EMBL+ DDBJ+ PPB revealed that the homology were low ( less than 30%). This implied that it was a newly found DNA sequence.

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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