A.8421BCD码 B.5421BCD码 C.余三码 D.2421BCD码
A. B. C. D.
A.4KB B.8KB C.16KB D.64KB
A.1/3VCC B.2/3VCC C.1/3VCC和2/3VCC D.1/3VCC和VCC
A.1 B.2 C.3 D.8
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