【单选题】【消耗次数：1】
我国规定的标准额定电压等级有（ ）
①
110kV 220kV 380kV
②
121kV 200kV 300kV
③
110kV 220kV 500kV
④
110kV 242kV 330kV
参考答案：
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根据我国规定，三相交流电力网的额定电压等级有： 380V 、 660V 、 3kV 、 6kV 、 l0kV 、 35 kV 、 65 kV 、 110kV 、 220kV 、 330kV 、 500kV 。
①
正确
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错误
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钻塔与高压线的安全距离：距10kV以上的高压线不小于（ ）m，距10kV以下的高压线不小于（ ）m。
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A50,30
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B30,50
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【单选题】
下列关于施工现场35kV外电线路的安全距离说法错误的是（）
①
A脚手架与外电架空线路的边线最小安全操作距离8m
②
B施工现场机动车道与架空线路交叉时最小垂直距离7m
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C起重机距架空线路边线最小垂直距离4m，最小水平距离5m
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D防护设施与外电线路最小安全距离2m
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