新式的动圈式话筒具有具有噪声低，频响范围宽，指向性好及保真高等优点．动圈式话筒膜片与线圈固定在一起，线圈套在磁铁上，当我们对着话筒讲话时，声音使膜片振动，膜片带动线圈一起振动，于是线圈中产生了随声音变化的电流，下列四个演示实验中原理与动圈式话筒相同的是（　　）

    In a small village, there is a teacher, a doctor, a driver, and a policeman. The four men are good friends. What are their names？One is Tom, one is Jack, one is Mike and one is John. Mike's, Jack's and Tom's children are classmates. John has no children. He teaches his friends’children at a middle school. Mike works at a police station. He loves his job very much. Jack has a car. He often drives his car to go to work or visit his friends. The doctor's house is next to the driver's, so the children often play together.

转变政府职能、处理好政府和市场关系，从最早的强调简政放权，激发市场活力首先就要放开；到简政放权、放管结合，管得好才能真正放得开；再到简政放权、放管结合、优化服务，服好务市场主体才能助其茁壮成。这个过程中，政策一步步完善，实践一步步推进，确保改革有序进行。由此可见（    ）

①绝对运动与相对静止的对立统一推动事物运动变化发展

②认识与实践的统一是具体的历史的统一

③我国政府有解放思想、实事求是、与时俱进、求真务实的品质

④客观事物复杂性、多样性决定了认识的反复性