An a-cswitchboard is usually（） the corresponding d-cboard because of the higher voltage and lower currents and smaller bus-bars.<br>A:larger and heavier than<br>B:as much as<br>C:smaller and lighter than<br>D:more dangerous than

An a-cswitchboard is usually（） the corresponding d-cboard because of the higher voltage and lower currents and smaller bus-bars.
A:larger and heavier than
B:as much as
C:smaller and lighter than
D:more dangerous than

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