For many years marine centrifuges were designed for （） operation, that is the machines were run for a period during which solids accumulated in the bowlThe machine was stopped when the accumulated solids began to impair its performance.<br>A:purifying<br>B:batch<br>C:long period<br>D:temporary

For many years marine centrifuges were designed for （） operation, that is the machines were run for a period during which solids accumulated in the bowlThe machine was stopped when the accumulated solids began to impair its performance.
A:purifying
B:batch
C:long period
D:temporary

出自：海船船员证

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