电路按照负载的连接方式可分为串联电路和并联电路。（）
参考答案：对
已知f（x）=x2-x+k，log2f（a）=2，f（log2a）=k，a≠1．求f（log2x）的最小值及对应的x的值．
Yang Lei had ______ unusual experience in Gansu Province. ______ experience
changed her life.
A．a, The
B．an, The
C．an, A
D．an, An
