Effects of na +, heavy metal nickel and vanadium, sulfur and viscosity of residue on activity of catalyst for S-RHT were investigated on a residue hydrotreating pilot unit.

在中型渣油加氢试验装置上考察了钠离子、镍、钒、硫和渣油粘度对s - RHT催化剂活性的影响。

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The good effect has been gained on the hypereutectic Al Si alloys treated with some double refining and modifying agents such as P, S, RE, Sr, Na, C, etc.

采用磷、硫、稀土、锶、钠、碳等进行双重细化变质处理过共晶铝硅合金已取得了良好的效果。

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Control on harmful elements such as K, Na, f, s in smelting is short of effective measures, which results in BF capacity factor low, BF process not smoothly and serious environment pollution.

对冶炼中有害元素钾、钠、氟、硫的控制还缺乏有效手段，致使出现高炉利用系数偏低、高炉不畅和造成环境的严重污染。

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Now DNA is a double helix and I've only shown you one part of the helix, right? I've shown you one upright strut and a base hanging off of it, but it forms a double helix because complementary strands of DNA strongly associate with one another and that's a very stable structure.

NA是双螺旋,我只是给你们讲了螺旋的一边,我给你们演示,一条链的支柱及碱基团,但其能构成双螺旋,是因为DNA是完全互补的两条链,彼此之间结合紧密,结构异常稳定

耶鲁公开课 - 生物医学工程探索课程节选

RNA polymerase is smart, it knows where it needs to go in order to make the copy of RNA that's required.

NA聚合酶很聪明,它知道该由什么位置介入,来转录所需要的RNA

耶鲁公开课 - 生物医学工程探索课程节选

It's loaded with phosphates which are negatively charged.

NA分子上有很多带负电荷的磷酸根

耶鲁公开课 - 生物医学工程探索课程节选

Perhaps that's why ACI-NA's Principato joined May for the announcement Tuesday: to assure that America's airports aren't such a bad place to be stranded.

FORBES: Fuel Costs Could Trim Summer Air Travel. A Bit.

Even most of Na's shots came off in less than 30 seconds of television time, well within a modern television viewer's comfort zone.

WSJ: John Paul Newport on Slow Play | Golf Journal

Na's group was "on the clock" for most of the back nine, which in itself is nerve-racking and distracting for the players and can lead to further fines if a player gets put on the clock 10 times in a season.

WSJ: John Paul Newport on Slow Play | Golf Journal