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单词
ballast tube
释义
ballast tube
ballast tube
[
′bal·əst ‚tüb
]
(electricity)
A ballast resistor mounted in an evacuated glass or metal envelope, like that of a vacuum tube, to reduce radiation of heat from the resistance element and thereby improve the voltage-regulating action.
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back (one or oneself) into a corner
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back on her feet
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更新时间:2025/3/14 15:55:47