题目

在下列各句的空白处填入一个适当的词，使句子意思完整、语法正确。【1】The room looks clean and_____because everything is put in the proper place.【2】David had a bad cold. His teacher asked him to see a_____with his parents.【3】In Class, teachers often_____students into small groups to have discussions.【4】The boy is too young to dress_____. He needs his mother’s help every morning.【5】My mother asked me to turn_____the TV so that I could focus on my homework.(2008，宁夏回族自治区)甲、乙两组同学要测定额定电压为2.5V小灯泡的额定功率． (1)如图是他们连接的实物电路，请在虚线框内画出对应的电路图． (2)闭合开关前，应将滑动变阻器的滑片置于________． (3)甲乙两组同学在实验中，使用的电流表、电压表及滑动变阻器均完好且连接正确，但闭合开关后，灯泡均不亮． 甲组出现的情况是：移动变阻器的滑片，电流表有示数且不断变化，电压表示数始终为零，灯泡不亮．你认为其电路的故障是________． 乙组出现的情况是：移动变阻器的滑片，电流表示数始终为零，电压表示数始终接近3.0V，灯泡不亮．你认为其电路的故障是________． (4)故障排除后，移动变阻器的滑片，当电压表的示数为2.5V时，电流表的示数如图所示，则通过小灯泡的电流是________A，小灯泡的额定功率为________W．