【单选题】电路的作用是实现能量的( )的转换、信号的传递和处理。
【简答题】For more than thirty years the statue millions of foreign people arriving by ship to live in the United States.
【单选题】Foreign weeds can be discovered after researchers had observed them for more than thirty years.
【简答题】A.More than thirty six thousand dollars. B.More than four thousand dollars. C.Twenty thousand dollars. D.Less than sy-four dollars.
【单选题】电路的作用是实现能量的( )和转换、信号的传递和处理