2009年下半年，德国公布其一款电动汽车问世，这款电动汽车的过人之处在于无需电池供电，而是将电能储存在一个超级电容里，这样可以让每次充电的时间比现有的汽车加油还快．报道中提到该超级电容的耐压为500伏，经过一个恒流器能为汽车提供稳定的5安工作电流，并可以连续工作1小时．如果这报道是可靠的，你能算出这个超级电容的电容量至少是多少？（电容的耐压是指充电过程中能到达的最高电压，超过这一电压，将会发生击穿放电）
由题，恒流器能为汽车提供稳定的5安工作电流，可以连续工作1小时，则电容器的电量为Q=It=5×3600C=18000C
电容为 C=
=Q U
F=36F18000 500
答：超级电容的电容量至少是36F．
| 完形填空。 | ||||
| It was black in the evening. Jason, a 12-year-old boy didn't want to go outside. But his mother, Branda, was worried about his father and 1 he go. That evening the man had to 2 his car, a Buick outside their house in the driveway. 3 enough, the wife hadn't heard a single 4 for at least one hour. "Go and find him," she told Jason. The kid stepped outside in the darkness and called into the shadows "Dad?" "Jason?" 5 was his father, but his voice sounded 6 . He spoke slowly, in a strange way. That evening, when the man had to get 7 the car to fix it, he used a forklift to lift the car. 8 , the man didn't place the blocks in front of the car' s front tires to keep it from 9 forward off the forks, which was exactly 10 it did afterwards. Little Jason saw his dad's feet 11 out from beneath the car. 12 to take a full breath, Old Jason sank into a sleepy, half-alive 13 . "Calm down. It will be OK." The boy 14 his mother. Now he couldn't afford to be scared. He climbed on and started up, the Buick started to come off the ground and 15 in the air. Minutes later, 911 policemen arrived. Old Jason 16 beneath the car, still breathing. It wasn't 17 his dad was loaded into an ambulance that the little boy 18 and sobbed. Little Jason says one happy change has come out of the 19 : he gets to spend more time with his dad. Old Jason, who hasn't touched a car 20 the Buick fell on him often spends evenings with his son playing. | ||||
|