Lead-Acid Batteries

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• 英语翻译翻译 Please do not over-charge the batteries for more than 3hours .Do not charge the batteries when in use
• This new method not only saves time but also saves energy ________ operating on two batteries instead to four.
• 什么是D cell batteries?不要只是翻译,
• 阅读下面短文,从A,B,C,D中选出一个能填入短文中相应空白处的最佳选项.Sometimes very good things have problems．Mobile phones are helpful but they 36 a lot of pollution and damage our health．If you read these things．you won't use your phones． First．they make pollution．When we make phones we use a lot of energy and a lot of chemicals．Mobile phone batteries are very 37 for the environment,and people change phones often-every day we throw away thousands and thousands． 38 , I want to talk
• how long do it's batteries last?为什么不能在last后加上for?不是last for+一段时间的吗?那what are you happy about?这句话对吗，What you are not satisfied with?
• 帮忙算一道题,关于正态分布和标准差的The life of an automotive battery is normally distributed with mean 900 days and standard deviation 35 days. What fraction of these batteries would be expected to survive beyond 1,000 days?一组自动电池的寿命服从正态分布并且均值是900天,标准差是35天,求寿命超过1000天的电池的概率是多少?PS：最后一句翻译的不好,原意是 这些电池里有多大的部分使用寿命能超过1000天
• 1.the city's_____ will be around by shops 2.there will also be much ______ bicycle plaths3.buses in city will try to _____ batteries and won't give off any black gases
• remember pick out the batteries.改正句子
• 用所给词的正确形式填空.Remember( ）（pick） out the batteries.Can you（ ）（dance）?
• Remember pick out the batteries(改正句子)
• 若关于x,y的二元一次方程组x+2y=z x-2y=5z的解也是二元一次方程5x-y=8的解,求z的值
• 11+22(1/2)+33(1/4)+44(1/8)+55(1/16)+66(1/32)+77(1/64)=