naa
abbr.
neutron activation analysis 中子放射性分析，中子活化分析;
not always afloat 非永远漂浮;
例句:
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Three cases of cysticerciasis showed Lac, Ace, Suc , Ala and no AA , Cho, NAA.
脑囊虫病3例,显示Lac 、 ace 、 Suc 、 Ala峰;没有显示AA 、 Cho和NAA峰.
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NAA or 6 - BA could cause the browning of mesoplyll protoplasts of potato.
NAA或6 - BA会引起马铃薯叶肉原生质体的褐化,但二者互作时却又抑制了原生质体的褐化.
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The results showed that the effect of NAA on lily scale cutting was significant.
结果表明,NAA处理对鳞片扦插繁殖有显著影响.
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Texas Governor George W. Bush is scheduled to speak at the NAA convention Thursday.
来自CNN
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But Mr Brookes dismissed the NAA exams watchdog as "venturing into the absurd" in its response to the marking problems.
来自BBC