When cleaning a tank by the Butterworth process，you should begin to pump out the slops ______．A.At the end of the drop scheduleB.When the process is startedC.When the process is finishedD.When the tank is clean
When cleaning a tank by the Butterworth process，you should begin to pump out the slops ______．
A.At the end of the drop schedule
B.When the process is started
C.When the process is finished
D.When the tank is clean
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