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關注：1
2013-05-23 12:21
求翻譯：The tube cathode (filament) is heated with a low-voltage current of a few amps. The filament heats up and the electrons in the wire become loosely held.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
The tube cathode (filament) is heated with a low-voltage current of a few amps. The filament heats up and the electrons in the wire become loosely held.
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