Studies were made of the feasibility of simulating acoustical and aerodynamic characteristics of a full-scale axial-flow air compressor with a scale model operating in Freon in a closed-loop system. Correlation was attained between model and prototype for both acoustical and aerodynamic performance. Ag...
2. They take in harmful gases from the air and produce oxygen for us to breathe.(P45, L5)它们从空气中吸收有害气体,产生氧气供我们呼吸。◇解析for us to breathe是“for+宾语+不定式”结构用作目的状语。其中 for表示对象,后面的不定式则表示目的。◇举例The policeman signed for him to stop.警察打...
We argue that the dominant source of 'air-like' noble gases in both the MORB and OIB is contamination by unfractionated modern air during sampling or sample preparation within the laboratory. We show that this is related to vesicularity and does not appear to be fully removed by current ...
Integrated model shows that atmospheric brown clouds and greenhouse gases have reduced rice harvests in India Previous studies have found that atmospheric brown clouds partially offset the warming effects of greenhouse gases. This finding suggests a tradeoff betwee... M Auffhammer,V Ramanathan,JR Vinc...
英语语法问题We have learned that air is a mixture of gases,___oxygen,water,vapor and carbon dioxide are the most important for what they do.A.whoseB.in whichC.of whichD.where答案选的是C,想问下为什么不能选D,另外介词为什么
In this work the distribution of radon and CO2 concentrations in some chambers of the cave is presented together with other environmental parameters such as temperature, pressure and air density, which are monitored continuously inside the cave. From the continuous data series of these parameters, ...
The abundance and isotopic composition of noble gases were determined in samples of CO 2 well gas from Harding County, New Mexico. Our results confirm the presence of radiogenic 129Xe and fissiogenic 131–136Xe. Relative to noble gases in air, the CO 2 gas is selectively depleted in the ...
ahave difficulty in doing 有困难在做 [translate] a不是一人份 Is not a human of share [translate] a你是否努力学习呢,是否讲究方法呢 Whether you do study diligently, whether is fastidious the method [translate] aIn addition, air contains a large variety of trace level gases at levels below ...
but more recent experiments found a change in partitioning behaviour with pressure showing that sufficient He and Ne can partition into the core during its formation20. However, this work is based on the low-pressure data (<16 GPa and 3000 K) of recovered samples of liquid iron and sili...
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