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trace substance造句

"trace substance"是什么意思  
造句與例句手機(jī)版
  • Air and soil quality - measurement of atmospheric deposition of organic trace substances ; funnel adsorber method - part 2 : determination of polynuclear aromatic hydrocarbons
    空氣和土質(zhì).有機(jī)痕量物質(zhì)的大氣沉積物測量.漏斗吸收
  • Air and soil quality - measurement of atmospheric deposition of organic trace substances ; funnel adsorber method - part 1 : sampling devices ; requirements , installation , application
    空氣和土壤質(zhì)量.大氣有機(jī)痕量物質(zhì)沉積物的測量.漏斗
  • It's difficult to see trace substance in a sentence. 用trace substance造句挺難的
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