题目

9/11 Memorial and Ground Zero Walking TourIn remembrance of the events that took place on September 11, 2001, take this 2.5-hour walking tour. Walk through the space of the former World Trade Center in New York City (NYC). A guide with a personal connection to the events of that day shares stories of tragedy and heroism. Please wear comfortable shoes.Lower East Side Food and Culture TourTake a deep dive into the food culture of Manhattan’s Lower East Side during this 3-hour guided small group tour. Follow your guide to hidden treasures for tastes of everything from pancakes to Chinese dumpli7．如图1所示为一种电容式位移传感器的原理图，当被测物体在左右方向发生位移时，电介质板随之在电容器两极板之间移动，已知电容器的电容与电介质板进入电容器的长度x之间的关系如图2所示，其中C0为电介质没有插入电容器时的电容，为判断被测物体是否发生微小移动，将该电容式位移传感器与电源、电流表、开关组成串联回路（图中未画出），被测物体的初始位置如图1所示，电路闭合一段时间后，下列说法正确的是（　　）A．若电源为直流电源且直流电流表示数不为零，说明物体一定在发生移动B．若电源为交流电源且交流电流表示数不为零，说明物体一定在发生移动C．若电源为直流电源且直流电流表示数变大，说明物体一定在向右发生移动D．若电源为交流电源且交流电流表示数变大，说明物体一定在向右发生移动