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【单选题】
爆炸性气体环境（1）的所有的电气设备和爆炸性气体环境（2）除照明灯具以外的其他电气设备的保护接地，说法不正确的是（）
A.
应采用专用的接地线
B.
金属管线、电缆的金属外壳等，只能作为辅助接地线
C.
接地线不能与敷设在同一保护管内
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