The localizer is composed of two parts:a constant current constant frequency signal source and a signal detector.

装置由恒流信号电源和信号检测装置两部分组成。

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Electronic load can be set for constant current, constant resistance and constant voltage operation.

电子负载可以设置为恒流﹐恒阻和恒压模式。

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There are three usual methods for excitation control following constant excitation current, constant power factor, and constant setting open-loop control.

常用的励磁控制方法主要有三种：恒励磁电流、恒功率因数、恒给定开环控制。

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The company, as shown by the growth difference between constant and current exchange rates, has been hampered by the Swiss franc which has gained 31 percent in value against the U.S. dollar.

FORBES: Record Sales at Swatch Group Despite Rising Swiss Franc

Federal estate tax rates remains constant at the current rates for all pertinent times.

FORBES: The Unified Credit Freeze, Not the Philly Freeze

And they require constant updating to remain current.

FORBES: Eliminate Your But!