【填空题】
37.HXD3电力机车主牵引回路正常时，由于只有___点接地，接地保护电路中流过的电流为零，接地信号检测传感器无信号输出。
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【单选题】
HXD1电力机车高压隔离开关处于合闸状态时，当电磁阀得到分闸信号，得电动作，打开气路，压缩空气经电磁阀进入压力气缸，推动操纵杆，使转轴旋转___，隔离开关分断。
A. 60°
B. 90°
C. 180°
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