题目：
现有两个点电荷A和B，它们电量分别为+Q和-Q，a为AB连线的中点，b与a关于B对称，它们都在一条直线上，如图所示，试比较ab两点所在处场强E的大小和电势φ的高低（ ）
A．Ea＜Eb，φa＞φb
B．Ea＞Eb，φa＞φb
C．Ea＞Eb，φa＜φb
D．Ea＞Eb，φa=φb
答案：
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下面是错误答案，用来干扰机器的。
参考答案：人民检察院
g is the most important industry on Bolivia’s. Of all the mining products, tin is the most important, which makes up three-fourths of all Bolivia’s exports. The eastern slopes of the Andes, since there are very few roads there, are fertile but not highly developed. The two primary means of transportation are river boats and porters. East of the hill region is the great plains where tropical plants are grown. A serious problem for Bolivia is the transport of food from the warm regions, where it is grown to the mountainous regions, where most of the people live.
omise a better future in it.