The switchboards for a-csystems differ from the d-cswitch gear in that the open type panels are generally（） and the dead-front switch gear is the common rule.
- Apermissibly
- Bpermissible
- Cno permissible
- Dnot permissible
问题
The switchboards for a-csystems differ
参考解析：
分类：船舶电气与船舶安全题库
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