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.<br>A:permissibly<br>B:permissible<br>C:no permissible<br>D:not permissible

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.
A:permissibly
B:permissible
C:no permissible
D:not permissible

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