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【单选题】
开关量输出的三种形式中,响应速度最慢的是( )。A.
继电器输出
B.
晶体管输出
C.
晶闸管输出
D.
以上都不对
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【简答题】已知某一时期内商品的需求函数为Q d =50-5P,供给函数为Q S =-10+5P,求:均衡价格P E 和均衡数量Q E
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