单选题Modern centrifuge designs enable continuous over a considerable period of timeThis is achieved by which is timed to discharge the sludge at regular intervals（）Aan injection processBan ejection processCa separation processDa heating process
单选题
Modern centrifuge designs enable continuous over a considerable period of timeThis is achieved by which is timed to discharge the sludge at regular intervals（）
A
an injection process
B
an ejection process
C
a separation process
D
a heating process
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