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请结合核酶的定义简述其生物学意义及其在现代医学领域可发挥的作用,可合理举例展望。

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(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