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【单选题】
下列关于船舶电气设备接地说法错误的是______。A.
电气设备的保护接地及工作接地，应接到船体永久结构或与船体相焊接的基座或支架上
B.
工作接地不能与保护接地共用接地导体和螺栓，但可以将设备的紧固螺栓作为工作接地的接地螺栓
C.
电气设备的保护接地及工修接地的接地柱的螺纹直径应不小于6mm
D.
当电气设备直接紧固在船体金属结构有可靠电器连接的基座（或支架）上时，可不另设置专用接地导体接地
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