According to the mathematics relation between thermal resistance and temperature, controlling the voltage and electric current of thermal resistance invariable to realize the constancy of temperature.

依据热电阻与温度的数学关系，通过控制热电阻的电压电流恒定实现温度恒定的控制。

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Invariable current charge method discussed current efficiency during the first charge process, experiment result indicated that current efficiency was low.

用恒电流方法探讨铬液流电解质初次充电过程中的电流效率，实验结果表明电流效率偏低。

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If irradiation time was invariable, the increment of beam current was not linear with the output of 18f-as a whole.

轰击时间一定的情况下，总体上束流强度的增加与18f -产量之间无线性关系。

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