nitrogen

Nitrogen: Gaseous chemical element, chemical symbol N, atomic number 7.

氮: 气态化学元素, 化学符号N, 原子序数7.

There are nitrogen, oxygen, a little carbon dioxide and water vapour.

它们分别是氮气, 氧气, 少量的二氧化碳和水蒸汽.

The lamp is full of gaseous nitrogen.

灯里充满了气体氮.

High concentration of sulphur dioxide, nitrogen, oxides and dust have long been known to be harmful.

人们早已知道,二氧化硫 、 氮 、 氧化物和尘埃浓度高是有害的.

Nitramines are substances which contain a nitro group bonded to nitrogen.

含有与氮原子相连的硝基的物质称为硝胺.

Nitrification is the key to biological wastewater nitrogen removal.

硝化作用是废水生物脱氮中的关键.

The granularity of coal, inoculation amount of bacteria and additional nitrogen have some effect on desulfurization.

煤样的粒度 、 菌接种量、加氮源对脱硫有一定影响.

And also it refers the prevention and treatment technology of nitrogen in groundwater.

同时,要提高三氮污染的野外监测水平和三氮污染的治理技术研究.

Nitrogen is the most important for high yield of rice.

氮对水稻高产最为重要.

The amide nitrogen of glutamine or asparagine functions more effectively than ammonia.

谷酰胺或天门冬酰胺的酰胺氮作用较氨更有效.

The atmosphere consist of more than 70 % of nitrogen.

大气中含有70%以上的氮气.

Nitrogen is a gas without colour or smell.

氮是一种无色无臭的气体.

Every tonne of coal contains, on average, 30 kilograms of nitrogen.

每吨煤平均含30公斤氮.

Can detect hydrogen, oxygen, nitrogen, carbon monoxide, methane, dioxide, ethylene, ethane, acetylene and other gases.

可对氢 、 氧 、 氮 、 一氧化碳 、 甲烷 、 二氧化碳 、 乙烯 、 乙烷 、 乙炔九种气体检测.

Since nitrogen is non corrosive , special materials of construction are not required to prevent corrosion.

由于氮无腐蚀性,不需要特殊的建材.但是,选择的建材必须能抗液氮的低温.

However, remained organic matter was not enough for the denitrification of nitrogen nitrate.

然而, 有机物过早消耗对硝化后产生的硝酸氮再行反硝化作用不利.

Common market, there are nitrogen, air, hydrogen, ammonia, acetylene, propane, steam and other special relief valve.

市面上常见的有氮气 、 空气 、 氢气 、 氨 、 乙炔 、 丙烷 、 水蒸气等专用减压阀.

Enterprises shall gradually adopt measures to control the nitrogen oxide generated by the burning of fuel.

　　企业应当对燃料燃烧过程中产生的氮氧化物采取控制措施.

Nitrogen dioxide and ozone may cause pulmonary edema.

二氧化炭和臭氧可以引起肺水肿.

Increased nitrogen levels in seawater upset the natural ecological balance of the oceans.

海水中增加的氮含量打乱了海洋的自然生态平衡.

The mechanism of the high nitrogen stainless steel showing excellent properties also analyzed and discussed.

本文还对高氮不锈钢表现出的优异性能的机制进行了分析和讨论.

The plant requires nitrogen in order to make proteins.

植物需要氮以便制造蛋白质.

What is the percentage of nitrogen in air?

空气中所含的氮的比例是多少?

The faeces contain nitrogen and it is that which fertilises the desert soil.

粪便含氮，而正是氮可以肥化荒芜的土地。