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隔离开关可根据地点、电压等级、极数和构造进行分类，GNl9-10系列高压隔离开关是三相交流50Hz的高压电器，适用于的10kV等级作为网络在有压无载的情况下，分断与关合电路之用。10kV配电线路常用的隔离开关类型为（）。
A.
单极
B.
三极
C.
户内式
D.
户外式
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