题目内容

[音频]

A. It would be silly.
B. It would be boring.
C. It would be amazing.
D. It would be unimaginable.

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[音频]

A. They get bored without electronic things.
B. They are happy without electronic things.
C. They wish they had more experience with electronic things.
D. They hope their grandchildren would use electronic things less.

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555电路共有个引脚，号引脚为输出端。

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555电路的内部由，，，，五部分组成。

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555定时器内部有3个5Ω的电阻组成分压器。

A. 对
B. 错

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[音频]

A. It would be silly. B. It would be boring. C. It would be amazing. D. It would be unimaginable.

[音频]

555电路共有 个引脚， 号引脚为输出端。

555电路的内部由 ， ， ， ， 五部分组成。

555定时器内部有3个5Ω的电阻组成分压器。

A. It would be silly.
B. It would be boring.
C. It would be amazing.
D. It would be unimaginable.

555电路共有个引脚，号引脚为输出端。

555电路的内部由，，，，五部分组成。