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键控脉冲
avia. key pulsing
IT key pulse
mil., air.def. keyer pulse; keying pulse
space keyed pulse
键控脉冲 、
radio key pulse
键控脉冲: 23 phrases in 10 subjects
Air defense3
Aviation3
Earth sciences1
Electronics2
General1
Geophysics2
Radio1
Space5
Technology2
Telecommunications3