小明家中电能表的参数如图所示，他家同时使用的用电器总功率不能超过 W；五月初 抄表的示数如图所示，若五月份交电费42元，且电价为0.5元/度，则五月末抄表的示数为 kW·h，若1min内电能表的转盘转过10r，则这段时间内，小明家所使用的用电器的总功率为 W。
2200 2797.5 500
题目分析：由电能表的参数可知，用电器总功率不能超过P＝UI=220V×10A=2200W；五月消耗的电能为W=42元/(0.5元/度)=84kW·h，则五月末抄表的示数为2713.5 kW·h+84kW·h=2797.5kW·h。1min内小明家所使用的用电器消耗的电能为W=(10/1200)×3.6×106J=30000J，小明家所使用的用电器的总功率为P=W/t=30000J/60s=500W。
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| There was a robbery near Harry's home one night. Harry was looking out of his window 1 . He saw a robber run out of a shop and he saw the robber 2 his mask (面具). He saw his face. Harry told his father what he had seen. When the police came,Harry and his 3 went to talk to them. "I saw the robber, " Harry told the police., "I can 4 him. He was about fifty years old. He 5 a big red nose. His ears were big. He was quite tall and thin. He had 6 wrong with his right leg. " " 7 do you know that?" one of the policemen asked Harry. "He lamed (跛行), " Harry said. "What was he wearing?" the other policeman asked. "He was wearing black trousers and a shirt, " Harry said. "Hismask was a lady's stocking. His shoes were white sports shoes. " "You are a very clever boy, " the policeman said. " 8 ! Now we can send out a description of the robber. " The police did this and the next day they caught him. They put him in a line 9 some other men. They asked Harry to point him out. Harry did this _10_ The police arrested (逮捕) the man. Then Harry went home with his father happily. | ||||
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