1500cm=1500*10^-2m=
(1500*10^-2)*(10^9)*(10^-9)m
我們知道奈米是10^-9m，所以把上面的10^-9換成奈米(n),那就會是1500*10^7奈米，而也等於15*10^9米，10^9是G，所以答案是D
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