氧气

When he mentions the 800×800 mm requirement for manholes, he calls it a requirement 'to walk in somewhere' which is hardly the case, e.g. when someone is entering a tank through such an opening with oxygen equipment on the back.

当他提到在800 × 800毫米的规定沙井他呼吁这方面的要求，'走在某处'，是很难的情况，例如：当有人正在进入一个坦克通过这样一个开放与氧气设备的背部。

I come of good stock—real estate, mineral water, oxygen, matchbooks: earth, water, air and fire, the old elementals of the material universe, a bellybutton economics , a linchpin one.

而我出身世家——靠的是不动产、矿泉水、氧气和纸板火柴：土、水、气、火，物质宇宙的古老元素，这是打娘胎里带来的经济学，也是最要紧的一点。

I come of good stock—real estate, mineral water, oxygen, matchbooks: earth, water, air and fire, the old elementals of the material universe, a bellybutton economics, a linchpin one.

我的成功缘于出身名门——房地产、矿泉水、氧气和纸板火柴：土地、水、空气、火这四种物质世界古老的组成元素，同时又是重要的经济命脉，就由我一手牢牢掌控。

For example, in the process of aeration or oxygen exposures, oxygen together with compounds in the sewage generates a different stench; Also, in the anaerobic process, in the role of microorganisms, sulfur from the sewage, reates hydrogen sulfide, mercaptans and sulfide compounds.

例如，在曝气或曝氧过程中，氧气可与污水中的化合物生成有异臭味的产物；又如，在厌氧过程中，污水中的硫在微生物的作用下，生成硫化氢、硫醇和硫醚等化合物。

It is used in medicine for therapeutic purposes and in the metals industry for steelmaking and metal-cutting applications.

氧气因其强氧化性以及作为生命赖以生存的必需品被广泛应用于医药治疗和冶金行业的钢铁制造及金属切割技术中。

When did metazoans appear, and what was the level of atmospheric oxygen at the time?

多细胞生物是何时出现的，当时大气层中氧气含量如何？

The mechanism of dioxygen oxidation of NTS to DNS in alkali solution under mild condition was inquired into. The result showed that the key step in the preparation of DNS from NTS was the formation of 4-nitro-2-sulfobenzyl anion as a result ionization of NTS in strong alkali and then oxidization to 4-nitro-2sulfobenzyl radical by activated dioxygen.

探讨了在温和条件下于碱的水溶液中氧气液相氧化4-硝基甲苯-2-磺酸制取4，4'-二硝基二苯乙烯-2，2'-二磺酸的反应机理，发现4-硝基甲苯-2-磺酸在碱作用下发生离子化生成4-硝基-2-磺酸基苄基阴离子，然后被活化的分子氧氧化成4-硝基-2-磺酸基苄基自由基是反应的关键步骤。

This multi-function moisturizing mask, produced for easy skin care, for the ones who are busy, that functions for oil absorption, exfoliation, cleansing, massage and moisturizing with minute and soft oxygen drops.

产品说明：在繁忙的日常生活中，为了迅速处理皮肤管理面世的产品，纤细、柔和的氧气气泡，消除皮脂与角质，增强清洁、按摩、保湿功能的多功能保湿面膜。

With yeasts. when large amounts of oxygen are present, yeast cell production is promoted.

对于酵母，当有大量氧气存在时，就促进酵母细胞的生产。

Above 400 C, most of the volatiles will have evaporated.

在280至500度间，生物量将随温度增长，即使没有氧气。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。