4. In electronic systems, repetitive-pulse waveforms are encountered
A. twice as often as single pulses
B. about as often as single pulses
C. less often than single pulses
D. more often than single pulses
4. In electronic systems, repetitive-pulse waveforms are encountered
A. twice as often as single pulses
B. about as often as single pulses
C. less often than single pulses
D. more often than single pulses