英语词汇“passive frequency doubler”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

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单词	passive frequency doubler
释义	SeePFD
随便看	spacefilling curve space filling curves space-filling curves spacefilling curves space filling function space-filling function space filling line space filling lines space-fixed complex-coordinate coupled-channel method space fixed reference space flight spaceflight spaceflight meteorology group space flight operations facility space flights space flight, simulation of spaceflight/spacecraft tracking and data network space-flight trajectory space flyer unit retrieval space force application space force enhancement space forces space frame spaceframe space frames