例句與用法

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1. The isotope ratio is directly used for comparing oils or gases .
   同位素比率直接用于比較各種石油或天然氣。
2. An obvious restraint in the use of isotope ratios results from the need to employ mass spectrometers .
   使用同位素比值法有著一個(gè)明顯的局限因素，就是要用質(zhì)譜儀進(jìn)行分析。
3. A lead isotope ratio data base of ancient chinese bronzes
   夏商周青銅器鉛同位素示蹤研究數(shù)據(jù)庫(kù)的構(gòu)建
4. The residue analysis in determination of sr isotopes ratio of carbonate
   碳酸鹽巖鍶同位素比值測(cè)定中的殘?jiān)治?i class="labawb" onClick="playMp3('sound_c_4')">
5. Isotope ratio measurement
   同位素豐度測(cè)定