单项选择题

信念度与真实度不一样，概率为0.8不意味着“80%是真实的”

A．对
B．错

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x=(1+3^2)(16mod7)/7用python程序表示为x=（）

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单项选择题

A charge q experiences a displacement within an electric field from Position A to B. The change in the electrical potential energy is , and the work done by the electric field during this displacement is W. The change in electric potential from A to B is equal to

A． q/W
B． qW
C． –qW
D．