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| 直热式阴极 | |||
| 旁热式阴极; 间接加热阴极; 旁热式阴极 | |||
| 间接受热式阴极 | |||
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| 间热式阴极; 旁热式阴极 | |||
| 间热式阴极 (旁热式阴极) | |||
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