配电盘、柜内的强电二次配线应采用截面不小于()mm2,绝缘电压不低于()V的铜导线。
参考答案:1.5;400
使用伸缩性小的透明材质制成等间隔网板、平行线板,然后放在图上适当位置进行土地面积量算的方法,叫()。
A.几何要素法
B.坐标法
C.求积仪法
D.膜片法
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