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八进制转二进制：467

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十六进制转二进制：BCD

Direct Current (DC) flows one way, then the other way, continually reversing direction.

A. 对
B. 错

Alternating Current (AC) always flows in the same direction.

A. 对
B. 错

Amplitude is the minimum voltage reached by the signal.

A. 对
B. 错