硝酸

It has a 'soft' neon tube ozoniser which does not produce NO fro air feed gas and therefore does not suffer from nitric acid production if the air feed gas is not totally dry and it does not produce an error in the NO2 reading due to a difference in window contamination due to the filtering effect of the NOx converter.

Signal Model 4000VM 提供 NOx/NO/NO2 连续输出，每3秒钟刷新一次数据，等同于 ECO 双反应室设计，它有一个氖管臭氧发生器，不会经由空气原料气生成 NO ，因此当空气原料气不完全干燥的情况下也不用担心产生硝酸，由于 NOX 转化炉产生过滤效应但污染物是在不同的窗口，所以 NO2的读数不会出现误差。

A safe method for p reparing nitro form isp resented which consists of nitrating a startingma2terialwhich the starting material dissolved or sus2pended in sulfuric acid, and a nitrating agent con2sisting of nitric acid, nitrate salts or nitrogen pentoxide is added to the sulfuric acid solution / sus2pension at 210℃ to + 80℃.

当汉语长难句内容的叙述层次与英文基本一致时，可以按照顺序翻译。例10 介绍了一种制备硝仿的安全方法，该方法首先硝化起始原料，起始原料溶解或悬浮于硫酸中，然后在- 10℃～+ 80℃，将硝化剂(由硝酸、硝酸盐或N2O5 组成)加入硫酸溶液或悬浮液中。

Therefore, the indirect pathway, involving an active intermediate nitrogen trioxide, is the main pathway of NDMA formation.

这一结论和NDMA的形成速率与亚硝酸的浓度的平方成正比的实验结果相一致。

The mainly conclusions in our research are as flowing: tungsten trioxide powders with 100 nm primary particle are obtained by spray drying,calcination and wet milling process, and an average size of quadric particle composed of agglomerated particles is 0.64 μm; tungtsen powders with 39 nm grain size and 60 -100 nm primary particle are produced directly from previous tungsten trioxide using one step reduction in hydrogen at 700℃, and an average size of quadric particle of tungsten powder is 2.91 μm; tungsten trioxide and copper tungstate compound powders with 100 nm - 200 nm primary particle are produced using ammonia metatungsten and copper nitrate as raw materials by spray drying,calcination and wet milling process;the compound powders are transformed completely into tungsten and copper compound powders by reduction in hydrogen at 700℃,in which tungsten grain size is 59 nm and copper grain size is 51 nm; primary particle size of compound powders is 80 - 120 nm,and an average size of agglomerated quadric particle is 1.86 μm; tungsten nitride powders with 35 nm grain size are prepared from tungsten trioxide powders by nitrogen treatment thoroughly in pure ammonia at 650℃, and an average size of agglomerated quadric particle is 0.64 μm in normal temperature.

研究结果表明：采用喷雾干燥—焙烧—球磨工艺可以制备出粒度约为100nm的WO_3粉体，它们在团聚后形成的二次颗粒平均粒度为0.64μm；采用一步直接氢还原方法可在700℃下从上述WO_3粉体制备出晶粒尺寸为39nm的、一次颗粒粒度为60-100nm的W粉体，其二次颗粒的平均粒度为2.91μm；以偏钨酸铵、硝酸铜为原料，采用喷雾干燥—焙烧—球磨工艺可制备出一次粒度为100-200nm的WO_3和CuWO_4混合粉体；采用氢还原工艺可在700℃下将这种粉体完全转变为W、Cu复合粉体，其中W的平均晶粒粒尺寸为59nm，Cu的平均晶粒尺寸为51nm；复合粉体的一次颗粒尺寸为80-120nm，在常温下团聚后形成的二次平均粒度为1.86μm；采用纯氨氮化工艺可以在650℃下由WO_3粉体制得WN，其晶粒尺度为35nm，在常温下团聚后的二次平均粒度为6.4μm。

Vegetable's roots absorb NO3(superscript -) mainly by the way of active absorption. Under retro-electrochemical gradient (170-250mv), NO3(superscript -) is absorbed into the interior of root through symplast in a state of ion.

蔬菜根系以主动吸收为主的方式吸收稍酸根离子，在逆电化学势梯度(170~250mv)下，硝酸根离子以离子态通过共质体途径进入根部内部。

Among them, the glue solvent addition-nitric acid had a greater impact, and its amount was controled at 8%~10% for the best; 2though the result of the ball catalyst prepared by oil ammonia column was better, the process was more complex; 3performance of the catalyst prepared by impregnation ball support was poor.

其中，胶溶剂硝酸的加入量有较大影响，其用量控制在8%～10%为最佳；2油氨柱滴球成型法制得的球形催化剂虽然齐聚反应效果较好，但工序较复杂；3浸渍球形载(来源：A61BcacaC论文网www.abclunwen.com)体法制得的催化剂催化性能较差。

Will Nitiric acid destroy a ready mixed oil varnish with the turpentine and linseed oil already mixed in?

硝酸是否能损坏已经混合了松脂和亚麻籽的清漆？

This paper repots a study of the adsorption behavior of silver on charcoal, reports a method for the decomposition of charcoal with sulfuric acid and nitric acid, and establishes a method for the preconcentration and determination of the sub μg/L level of silver in natural water.

本文研究了银在活性炭上的吸附行为，提出了以硫酸、硝酸反复交替炭化，消化彻底分解破坏活性炭的处理技术。建立了活性炭富集火焰原子吸收测定天然水中亚μg/L水平银的分析方法。

Nitrite reductases are the key enzymes in the denitrification pathway of the nitrogen cycle.

亚硝酸还原酶是反硝化过程中的关键作用酶，它使NO2？转变成NO，减轻了水体中的氮污染。

Spraying K, Zn and B fertilizer at heading stage had a certain effect on nitrogen metabolism of wheat, and could increase the activities of nitric acid reductases and Alanine transaminase in fig leaves, so improve the nutrition quality and processing quality of wheat.

灌浆期喷施钾、锌、硼肥，可以不同程度地提高小麦旗叶的硝酸还原酶、谷丙转氨酶活性，改善小麦的营养品质和加工品质。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。