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If a spaceship travels at an average speed of 6*(10^10) kilometers per year, how many years will it take the spaceship to travel 3*(10^30) kilometers?
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A.$$5*(10^2)$$
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B.$$10^11$$
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C.$$5*(10^19)$$
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D.$$5*(10^20)$$
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E.$$5*(10^21)$$
C显示答案
