题目

Scientists say they have developed the first technology of its kind to allow children with communication problems to converse better. How was school today? is a software system to enable children with disabilities such as cerebral palsy （脑瘫） communicate faster. The system is the result of a project between computing scientists from the Universities of Dundee and Aberdeen and Capability Scotland. Dr Ehud Reiter, from the University of Aberdeen's School of Natural and Computing Sciences said: How was school today? uses sensors, swipe cards, and a recording device to gather information o在图中所示的电路中，闭合开关S后，电流表A1的示数为l.2A，电流表A2的示数是0.8A，则通过R1的电流为 ，在通电2s内，通过R1的电荷量为 ．