Difference between revisions of "怎样考取低压电工证理论篇"

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怎样考取低压电工证理论篇 (view source)

Revision as of 10:11, 19 August 2024

No change in size ,  19 August
→‎辨异
 
; 电流频率
*: 工频电流：工业用电频率的电流，一般 50Hz
*: 高频电流：远高于高频电流，一般几百 kHz 至 MHz
 
; 距离
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