问题描述：
[单选]
若导线的电阻不变，只要导体的温度保持不变，则流过导线的电流与所维持的电位差成正比。（）
A．Provided the resistance of a wire is constant, the current passed through it is proportional to the potential difference maintained, as long as the temperature of the conductor remains unchanged.
B．Provided the resistance of a wire is constant, the current passing through it is proportional to the potential difference maintained, as long as the temperature of the conductor remains unchanged.
C．The current flowing through a conductor is proportional to the potential difference maintained, providing that the conductor"s resistance remains the same and the conductor"s temperature remains the same.
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