单项选择题

High-speed rotation in a centrifugal purifier can produce a force （） the force of gravity.

A.many thousand times larger than
B.the same as
C.many thousand times smaller
D.none of the above

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The separation of impurities and water from （） is essential for good combustion of diesel engines.

A.lube oil
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Which of the following may hardness of the boiler water cause?（）
(1) scale formation
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