1) The drilling tool should be measured precisely.
请准确丈量钻具。
2) basis measurement
丈量标准
3) standard rig
标准钻具
4) mo(u)ld accuracy
模具准确度
5) accurate mass
准确质量
1.
Using polyethylene glycol(PEG) and the protonated molecular ion(MH +) as internal reference compounds,the accurate mass of the fragment ions were determined,The fragment ions were elucidated,and their fragmentation patterns were discussed.
本文采用电喷雾 /飞行时间质谱法 ,对 5个红霉素类抗生素进行了源内CID研究 ,并以PEG40 0及各样品质子化分子离子 (MH+ )做为内标物 ,对碎片离子进行了准确质量测定 ,确认了这些碎片离子 ,并总结了此类化合物的裂解规律。
2.
Using polyethylene glycol(PEG) as internal reference, electrospray ionization(ESI)/time - of -flight mass spectrometry(TOF - MS) was developed to determine the accurate mass of the protonated molecular ions of five erythromycin analogue antibiotics.
研究了聚乙二醇(PEG)为内标物的电喷雾(ESI)/飞行时间质谱(TOF-MS)准确质量测定方法,并应用于5个红霉素类抗生素质子化分子离子(MH~+)的质量测定。
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