名词
中文翻译：直接加热阴极
同义词：
['Directly heated cathode', 'Directly heated cathode electrode']
例句：
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1. The direct-heated cathode is a crucial component in the production of high-energy density batteries.
直接加热阴极是生产高能量密度电池的关键部件。
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2. The researchers used a direct-heated cathode to improve the efficiency of their solar panels.
研究人员使用直接加热阴极来提高他们的太阳能板的效率。
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3.The new design of the cathode uses a direct-heated cathode to increase the output power of the device.
新设计的阴极采用了直接加热阴极，以提高设备输出功率。