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symmetrical antenna
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symmetrical antenna
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【长、中、短波天线】
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symmetrical antenna
对称天线
在馈电点将天线分为两半,这两半的几何结构形式和尺寸完全相同的天线。如菱形天线、鱼骨形天线等。反之,则称为不对称天线。
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digital pulse-shape discrimination
digital quantity
digital quarantine technology
digital radiation model
digital radio
digital radiographic testing system
Digital radiography,DR
digital railway
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Digital Reading
digital receiver/transmitter
digital recorder for H.V.measurement
digital recording
digital rectal examination
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