... nitrogen molecular laser 氮分子激光器 nitrogen needle 氮针 nitrograph 氮气浓度测定仪 ...
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nitrogen n needle 氮针
needle nitrogen content 针叶含N量
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Objective: To manufacture a simple sample enrichment appliance with nitrogen gas blowing needle and its application.
目的:一种氮气针吹(NNB)药物试样富集装置的研制和应用。
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