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.

针对影响污染物散发及分布特点，给出了室内挥发性有机化合物的具体控制方法，如源头控制、通风及室内空气净化等。

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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.

本文阐述了西蒙娜·薇依对“恶”的概念的思考，并按照薇依的指引，对恶的本质、特征、根源及克服恶的途径进行了提示。

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