题目内容

What would you like to suggest samples of the amazing range of souvenirs for a foreign tourist to China?

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What are the “Four Treasures of Study”?

Did the tourist in the dialogue buy Pan Tianshou’s original work? If not, what did he buy?

升压斩波电路能够升压和哪些元器件有关？

A. 电感
B. 电容
C. 电阻

降压斩波电路的输出电压（）输入电压

A. 低于
B. 高于
C. 等于