额定绝缘水平（rated insulation level) 标准绝缘水平（standard insulation level) 变压器绕组的全绝缘（uniform insulation of a transformer winding) ..
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The builders in engineering did not use a level of exterior wall thermal insulation material, and other similar but not to use a level standard unit will be shutdown a!
建筑商在工程中未使用A级外墙保温材料，而使用同类其它但未达到A级标准的单位将被罚停工！
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