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第1题

In a diode, current flows in ()direction across the junction. A.only one B.two C.three D.all of above
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第2题

A ()amplifier provides signal amplification with little or no distortion, so that the output is proportional to the inpu
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第3题

The term modem is derived from the words ()modulate emphasis A.all B.modular emulation C.multiplex or demultiplex D.
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第4题

The transmission method which uses start stop bits after each character is () A.synchronous B.asynchronous C.full dup
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