问题
选择题
Your story is perfect, I've never heard _____ before.[ ]
A. the better one
B. the best one
C. a better one
D. a good one
答案
答案：C
搜题请搜索小程序“爱下问搜题”
Your story is perfect, I've never heard _____ before.[ ]
A. the better one
B. the best one
C. a better one
D. a good one
答案：C
个小球A,用一根原长为L0由绝缘材料制成的轻弹簧把A球和另一个小球B连接起来.然后让两球带上等量的同种电荷Q,这时弹簧的伸长量为X1,如果设法使AB的电
量各减少一半,这时弹簧的伸长量为X2,则( )
