题目内容

In order to provide the interface circuit for the 8 × 8 non coding keyboard of scanning method, two 8-bit parallel input ports and one 8-bit parallel output port are needed in the interface circuit.

A. 对
B. 错

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When LED nixie tube works in dynamic display mode, only one nixie tube is lit at the same time.

A. 对
B. 错

当总效用达到最大值时,边际效用()

A. 为最大值
B. =0
C. 大于0
D. 小于0

当总效应增加时,边际效用()

A. 为正值,且不断增加
B. 为正值,且不断减少
C. 为负值,且不断增加
D. 为负值,且不断减少

无差异曲线被用于说明()

A. 消费者偏好
B. 消费者收入
C. 商品价格
D. 上述答案都对

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