A "trash cover" is:
Sound waves too high in frequency to be heard by the human ear, generally above 20 kHz, are known as:
The process of combining a number of transmission into one composite signal to be sent over one link is called:
Which of the following applies to the laser as a means of communication?
Which of the following is not correct in regard to microwave transmissions?
Which of the following is not a legitimate purpose of an investigation for employee misconduct?
