天然气

This paper describes the preparation method, series composition, concentration limits, precision and results of stability investigation of four series standard gas of alkane, non-hydrocarbon, sulfur-containing compound and water.

本文叙述了天然气分析用的烷烃、烃、硫化合物和水四个系列标准气的制备方法，系列构成，浓度范围，精度和稳定性考察结果。

Compared with gasoline, compressed natural gas is a relatively safe fuel.

与汽油相比，压缩天然气是相对安全的燃料。

Compressed Natural Gas is a clean car technology that is here, now.

压缩天然气这种清洁汽车技术，现在就存在。

In process of gas injection and withdraw, natural gas is compressed and swelled...

在气库的注采过程中，天然气的不断压缩和膨胀并在井筒和地层中产生热交换，引起井筒和溶腔内的温度和压力变化。

Cummins Corporation is the world's design, production and marketing of diesel engines and compressed natural gas engines of the largest enterprises.

康明斯公司是当今世界设计、生产和销售柴油发动机和压缩天然气发动机的最大企业。

Engines using compressed natural gas, liquified petroleum gas and other alternative fuels

使用压缩天然气、液化石油气和其他代用燃料的发动机

There is a growing realization that the only effective way to achieve further reductions in vehicle emissions—short of a massive shift away from the private automobile—is to replace conventional diesel fuel and gasoline with cleaner-burning fuels such as compressed natural gas, liquefied petroleum gas, ethanol, or methanol.

H 人们逐渐认识到，唯一有效的方法来进一步减少车辆尾气的排放量——除了大规模减少私人汽车——替换传统的柴油和汽油，用燃烧得更加清洁的燃料，比如说压缩天然气、液化石油气、乙醇、或者甲醇。

There is a growing realization that the only effective way to achieve further reductions in vehicle emissions --short of a massive shift away from the private automobile--is to replace conventional diesel fuel and gasoline with cleaner--burning fuels such as compressed natural gas, liquefied petroleum gas, ethanol , or methanol .

人们逐渐认识到实现车辆尾气排放更进一步减少的唯一有效方法--大规模削减私人小汽车除外--是用燃烧更洁净的燃料，如压缩天然气、液化石油气、乙醇、甲醇代替传统的柴油和汽油。

Gas Distribution series of devices - from the control point of view, a semi-automatic and fully automatic with two gas from the gas source is composed of two groups of (liquefied petroleum gas, compressed air) and three groups of (nitrogen , Hydrogen, propane or butane) of the points is to provide natural gas and gas cities of the ideal alternative source of gas equipment, especially for gas production-line equipment manufacturers and test firing of Quality Supervision, Inspection departments for laboratory and performance of combustion Test.

从配气气源组成有二组份及三组份（氮气、氢气、丙烷或丁烷）之分；是提供天然气和城市人工煤气替代气源的理想设备，特别适用于燃气器具生产企业在线生产试烧和质量监督检验部门用于实验室及燃烧性能的检验。

There is a growing realization that the only effective way to achieve further reductions in vehicle emissions - short of a massive shift away from the private automobile - is to replace conventional diesel fuel and gasoline with cleaner-burning fuels such as compressed natural gas, liquefied petroleum gas, ethanol, or methanol.

这些清洁燃料包括压缩天然气、液化石油气、乙醇和甲醇。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。