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有一噬菌体DNA长17μm，问它含有多少对碱基，螺旋数为多少？

(single choice) A circuit that converts an analog waveform to a digital signal is commonly called a(n)

A. DAC
B. PLD
CAD
D. ADC

(single choice) A circuit that converts an digital signal to an analog waveform is commonly called a(n)

A. PLD
B. CAD
C. DAC
D. ADC

Of the circuits listed, the one that is most likely to be found in a CD player is a(n)

A. programmable logic device
B. SPLD
C. analog-to-digital converter
D. digital-to-analog converter