{{i}} quEstions 4 to 7 ArE BAsED on thE Following ConvErsAtion.At thE EnD oF thE ConvErsAtion, you will BE givEn 20 sEConDs to AnswEr thE quEstions. now listEn to thE ConvErsAtion.{{/i}}

thE ComputEr sEnDs signAl in thE Form oF ______.A．ElECtriCAl impulsEs
B．mAChinEs
C．instruCtions
D．AutomAtiC impulsEs