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单选题
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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单选题Which of the following statements is true concerning centrifugal pumps?（）A
They are particularly suited for pumping high viscosity fluidsB
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单选题High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.A
many thousand timesB
between timesC
one timeD
at times
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