【简答题】某电唱机拾音头内阻为1MΩ,输出电压为1V(有效值),是回答下列问题: A. 如果直接将它与10Ω扬声器相接,扬声器上的电压有效值为多少? B. 如果在扬声器和拾音头之间接入一个放大器,该放大器的输入电阻Ri=1MΩ,输出电阻Ro=10Ω,负载开路时电压增益为1。这时扬声器上的电压有效值为多少?
【判断题】古人认为,婚配对社会很重要,且婚配中的男方更为重要。 ()
【单选题】A speech on the topic of introducing Chinese tea culture can be classified into ( ).
【简答题】本学期第一期英语角是总第几期?(填数字)
【简答题】What do you know about Lu Yu and his Tea Classic? Does it have a great influence on Chinese tea culture?
【单选题】Which of the following hasn’t influenced Chinese tea culture?
【判断题】A major event of this time was the completion of Tea Classics , the cornerstone of Chinese tea culture, by Lu Yu, Tea Sage of China.
【单选题】某放大电路在负载开路时的输出电压的有效值为 4 V ,接入 3 k W 负载电阻后,输出电压的有效值降为 3 V ,放大电路的输出电阻( )。
【判断题】Zheng He in Ming Dynasty transmitted Chinese tea culture to Africa during his seven voyages.
【判断题】Chinese Tea culture values harmony and sincerity.