Which of the following achieves high spectral efficiencies because the spacing of each carrier is as close as theoretically possible?
A. Direct-sequence spread spectrum (DSSS)
B. Quadrature amplitude modulation (QAM)
C. Orthogonal frequency-division multiplexing (OFDM)
D. Code-division multiple access (CDMA)
C
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Herbicides are generally the most toxic of pesticides to soil organisms
Indicate whether the statement is true or false
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Good electrical insulators include:
A) Copper, aluminum, and steel. B) Ceramic, rubber, and plastic. C) Steel, iron, and aluminum. D) Gold, silver, and copper.
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Numbers are commonly used in balloons.
Answer the following statement true (T) or false (F)
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A replacement roof is 54 inches long and 32.5 inches wide. One tube of adhesive will cover 76 linear inches. How many tubes are needed?
What will be an ideal response?
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