导游人员不应在旅游活动的初期阶段就告诉旅游者具体的日程安排，以免他们提出不同意见。 ()
A．正确
B．错误
参考答案：错
15. It was with great joy _____ he received the news ______ his lost daughter had been found.
A．because, when
B．which, that
C．since, how
D．that, that
A．副线圈输出交流电的频率为10Hz
B．交流电压表的示数为20V
C．电阻R上消耗的电功率为2kW
D．原线圈中电流的最大值为100A
V