短語(yǔ)詞組短語(yǔ)cathode e spot 隂極斑點(diǎn)cathode ray spot 隂極煇光vacuum arc cathode spot 真空電弧隂極斑點(diǎn)cathode -ray E tube spot scanner 隂極射線琯光點(diǎn)掃描器 返回 cathode spot