题目内容

[音频]

A. Entertain them with big meals.
B. Let them enjoy some holiday games.
C. Give them handmade thank- you cards.
D. Send their families some holiday gift cards.

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[音频]

A. Workers who have to work during holidays.
B. Employees who intend to earn extra money.
C. Big companies that usually close on during holidays.
D. Small businesses that try to be morecompetitive.

两个8欧的电阻串联,其等效电阻等于()欧?

A. 8
B. 16
C. 4
D. 64

两个8欧的电阻并联,其等效电阻等于()欧?

A. 8
B. 16
C. 4
D. 64

常见的电路等效变换有哪些?

A. 多个电阻串联
B. 多个电阻并联
C. 多个电阻混联
D. 理想电压源和理想电流源

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