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【单选题】
The six elements in a speech communication process involve_______.A.
speaker, message, channel, listener, feedback and situation
B.
speaker, message, channel, listener, feedback and purpose
C.
speaker, message, channel, listener, influence and situation
D.
none of the above
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举一反三
【单选题】An amplifier has values of Pin = 20 mW and Pout = 60 W. What is the value of the power gain in dB for the circuit?
A.
3000 dB
B.
69.5 dB
C.
34.8 dB
D.
None of the above
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