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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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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
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单选题Which of the following will increase the height of the center of buoyancy for your vessel?（）.A
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单选题Which of the following will increase the positive stability of your vessel?（）.A
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单选题To start the ejection process the oil feed to the centrifuge is first shut off and the oil remaining in the bowl removed by admitting （）.A
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单选题“A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft（）A
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单选题When reassembling the bowl of a disk-type centrifuge, the bowl or locking ring is rotated （）.A
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考题
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 manuallyB
by separating the lower part from the upper part automaticallyC
by separating the upper part from the lower part automaticallyD
continuously
考题
单选题What does the DB_FLASHBACK_RETENTION_TARGET parameter configure？（）A
An upper limit on how far you can flash back the database，depending on the information in the redo logsB
An upper limit on how far you can flash back the database，depending on the information in the undo tablespaceC
The amount of time for which the flashback data is to be kept in the flash recovery area， provided that there is enough spaceD
The amount of time for which the flashback data is guaranteed to be kept in the undo tablespace，provided that there is enough space
考题
单选题Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl （）.A
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flattening of the bowl neoprene O-ringsB
operation within the explosive rang of the fuelC
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