In our school library there a number of books on science, and in these years the number of them growing larger and larger.
有关下列山脉两侧地理事项的叙述正确的是( )
①此时小灯L____(选填“一定发光”、“一定不发光”或“可能发光”).
②将电流表A与R位置互换后,电压表V的示数不发生变化,电路中可能存在的故障是(写出所有可能故障)____.