The City of Big Shoulders refers to _____.
A. New York
B. Los Angeles
C. Houston
D. Chicago
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Which of the following architecture are not located in NY?
A. Statue of Liberty
B. Golden Gate
C. Empire Building
D. Brooklyn Bridge
多谐振荡器可产生()。
A. 正弦波
B. 矩形波
C. 三角波
D. 锯齿波
由555定时器组成的单稳态触发器,若加大电容C的电容值,则()
A. 增大输出脉冲uO的幅值
B. 增大输出脉冲uO的宽度
C. 对输出脉冲uO无影响
由555定时器组成的多谐振荡器,欲使振荡频率增高,则可()。
A. 减小C
B. 增大R1、R2
C. 增大 UDD