单选题A centrifuge of which the bowl is arranged as the upper and lower parts separate discharges the sludge（）Aby opening the separator manuallyBby separating the lower part from the upper part automaticallyCby separating the upper part from the lower part automaticallyDcontinuously
单选题
A centrifuge of which the bowl is arranged as the upper and lower parts separate discharges the sludge（）
A
by opening the separator manually
B
by separating the lower part from the upper part automatically
C
by separating the upper part from the lower part automatically
D
continuously
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