单项选择题
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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Electrical supply is always needed even if only for lighting so after a ship goes into service it is extremely rare for the main bus-bars to be dead, it therefore follows that the bus-bars are continuously alive（） the life of the ship.
A.along
B.will
C.throughout
D.for -
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A.an alternating
B.a rush
C.a direct
D.an exciting -
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Shore power must be（） during dock repair.
A.disconnected
B.switched off
C.cut off
D.connected
