The College curriculum became independent from Puritan philosophy ever since John Leverett became the president because he was the first non-clergyman president.
A.
Y
B.
N
C.
NG
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【单选题】在真空中有两个点电荷相距为 r 时,相互作用力为 F ,若两个电荷的电量不变,要使两电荷间的相互作用力变为原来的 16 倍时,两个点电荷的距离应为