题目

铅蓄电池在现代生活中有广泛应用，其电极材料是Pb和PbO2，电解液是硫酸溶液。现用铅蓄电池电解硫酸钠溶液一段时间后，假设电解时温度不变且电极为惰性电极，下列说法正确的是（    ） A．蓄电池放电时，每消耗0.1molPb，共生成0.1mol PbSO4 B．电解硫酸钠溶液时的阳极反应式为：4OH－－4e－=2H2O+O2↑ C．电解后，硫酸钠溶液中有晶体析出，但c(Na2SO4)会变小 D．蓄电池放电一段时间后其电解液中H2SO4的浓度、密度都变大阅读下面的短文,将短文中画线部分的句子译成中文。When you think about competitions, you probably think of sports such as basketball and football. Not all competitions are sports, though. One example is the Rock Paper Scissors World Championship.Some people might consider the Rock-Paper-Scissors competition to be strange. Hundreds of people run down a hill and chase（追赶） a huge wheel of cheese.（1）At first,the competitions was held for the people who lived in the local village. But now people from all over the world come to attend it.（2）They are just a few of the crazy games that people play.1.____________________________________2.____________________________________