单项选择题

如图所示，在半径为R、介电常数为的均匀介质球的中心放有点电荷+q，在介质球外是真空。设无穷远处为电势零点，则在介质球外部到球心距离为r(r>R)处P点的电势为

A、
B、
C、
D、

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单项选择题

The correct statement below is ______.
A、Something is extreme, especially when we study Intercultural communication
B、No culture is superior to another
C、There are some ready-made answers about intercultural communication to be expected
D、We are not to do both “learning about culture” and “doing culture”

单项选择题

哪位国家领导人，最早决定对外开放？

A．毛泽东
B．周恩来
C．邓小平
D．江泽民