This paper brings forward the indoor VOCs concentration control means, such as source controlling, ventilation and indoor air purifying based on the trait of VOCs emitting and distributing.
According to the technological trait of pulse MAG welding, the pulse welding power source has been requested to have better dynamic character, biggish output power and upper reliability.
根据脉冲mag焊工艺特点，脉冲焊电源必须具有良好的动态特性、较大功率输出以及较高的可靠性。
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The article expounds the essence, trait and the source of Simone Weil s concept of Evil as well as the ways to prevent away from it simply by taking the patriotism for example.