The polypropylene-based melt-blown non-woven fabric has high efficiency and low filtration resistance,so it can be used widely as filtration material. The processing parameters,such as air pressure,die-to-collector distance,air temperature and so on,can affect its structure and then the filtration properties. Some characteristics of melt blown polypropylene non-woven fabric are talked about in this article. According to some research done by the formers,it discusses and sums up how its processing parameters af...
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The pain that penetrates each joint is brought about by a change in air pressure, such as the change that proceeds a storm.
穿透每个关节的疼痛是由气压的变化引起的，例如暴风雨的变化。
The effect of car care best practices, such as changing your oil or checking a tire's air pressure, is not implicit unless we have measurements to quantify what we gained or lost.
采取汽车保养最佳实践所产生的效应，例如更换机油或检查轮胎的气压，并不能用于准确地评价质量，除非我们确实找到了度量质量好坏的手段。
At altitude, the air pressure is lower, and so are aerodynamic effects such as drag and lift, ultimately causing balls to travel faster and straighter than they would at lower altitude.
由于地处高海拔地区，气压较低，因而作用在球上的阻力及升力所产生的空气动力效应也会发生相应反应，最终导致球在空中飞行速度比在低海拔地区快，飞行的路线也更直。
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