词汇	QSL bureaux
释义	QSL bureaux 🌏QSL局
随便看	beam patch beam path beam path distance beam path geometrical arrangement Beam path location beam path roller beampattem optimization beampattern beam pattern Beam-pattern beam pattern generator beampattern optimization beam pencil beam penetration beam penetration cathoderay tube beam penetration cathode ray tube beam-penetration color display beam pentode beam-pentration color display beam penumbra Beam performance beam performance goal beam phase beam phasing beam physics characteristics