单选题An a-cswitchboard is usually（） the corresponding d-cboard because of the higher voltage and lower currents and smaller bus-bars.Alarger and heavier thanBas much asCsmaller and lighter thanDmore dangerous than
单选题
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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