aThe gases released, which include methane, carbon dioxide, and usually some hydrogen sulfide, tend to rise in the steam chamber, filling the void space left by the oil and, to a certain extent, forming an insulating heat blanket above the steam. 正在翻译,请等待...[translate]...
athe amount theoretically required to oxidize the fuel. Excess air is usually expressed as a percentage of the air required to completely oxidize the fuel.[translate] acomplete combustion produces mainly carbon dioxide (CO2) and water (H2O); however, small quantities of carbon monoxide (CO) and...
Note: Because composite decking boards are more fire-resistant, some people think it is safe to use in fire pits. However, this is not the case, and even though it is more fire resistant, it is not completely incombustible. Excessive temperatures are not usually a good idea for wood or ...
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男，28岁。受凉后发热咳嗽、咳痰1周，气促2天，意识模糊1小时。查体:T39.8°C，血压80/50mmHg，口唇发绀，双肺可闻及较多湿啰音，心率109次/分，未闻及杂音，四肢冷。血常规WBC21x109/L，N0.90。该患者最可能的诊断是
A plant needs sunlight and carbon dioxide (二氧化碳 ) for making food and it also needs water and salts from the soil to make food too. There are certain cells ( 细胞 ) in the leaves which change carbon dioxide and water into sugar. To do this the cells need energy, which they get ...
Dedicated to spreading the Good News of Basic and Applied Science at great research institutions world wide. Good science is a collaborative process. The rule here: Science Never Sleeps. Another rule here: Scientists "invent" nothing. Instead scientists
People usually like to mark their space. If you are on the beach you may have spread your towels around you; on the train you may have put your coat or small bag on the seat beside you; in a library you may spread your books around you. Once I was travelling on a train to ...
Soil forms from the bottom up.Over time bedrock is attacked by rain, wind,frost, and snow.It is gradually broken down into smaller particles in a process called weathering.Plants begin to grow,and rotten materials enrich the topsoil.Most of the soil in Eastern Canada,for example,was formed ...
An amount greater than 2 moles per mole of pyrimidine is usually unnecessary. When higher water concentrations are used, control of reaction acidity by addition of a base, such as sodium hydroxide, to between pH 0 and 5 and preferably between pH 1 and 3 is desirable. Other oxidants which ...