If 64 raindrops combine into a single drop . The ratio of total surface energy of 64 drops to that of a single drop is ,
If 64 raindrops combine into a single drop . The ratio of total surface energy of 64 drops to that of a single drop is ,
A. `64:1`
B. `3:1`
C. `16:1`
D. `4:1`
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