Formerly the arc length error for the insulation resistance instrument is defined by scale arc length. At present national standard determines that the percentage of indicated value expresses it.
绝缘电阻表以前是按标度尺弧长定义的弧长误差，现行国家标准规定以指示值的百分数表示。
The physical phenomenon of fault arc was described and the standard of the protection of fault arc was introduced.
在阐述故障电弧物理现象的基础上，介绍了故障电弧防护标准。
The national standard is suitable for welded joint of carbon steel and low alloy steel with gas welding (being used for sheet metal), manual arc welding and gas - shielded welding.
本标准适用于气焊(用于薄板)，手工电弧焊及气体保护焊焊接的碳钢、低合金钢焊接接头。
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