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。
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。
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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