题目

A father is very worried about his son.    61   acts like a coward. So his father paid a visit to the master and    62   (ask) him to train his son. The master said, “I promise I'll be able to train your child     63   a real man in three months.” Three months later, his father came 64 (pick) the child. The master arranged a match between the child  65 his coach to show the three-month training result. At Round One, the child 66 (knock) down and fell to the ground. He stood up to meet the challenge. But he was knocked down again, and once again h如图两灯泡L1、L2在盒内的连接方式未知，电源电压为6V．开关闭合后两灯均发光，电流表读数为0.9A；若把L1取下，L2仍发光，电流表读数变为0.3A（1）L1和L2是并联还是串联的？（2）取下L1后，5秒内L2消耗多少电能（3）L1的电阻多大？