题干

如图中,两电极上发生的电极反应为:
a极:Cu2+ + 2 e= Cu      b极:Fe - 2 e= Fe2+
下列说法中不正确的是

A:该装置可能是电解池

B:a极上一定发生还原反应

C:a、b可能是同种电极材料

D:该过程中能量的转换一定是化学能转化为电能

上一题 下一题 0.0难度 选择题 更新时间:2012-06-27 11:17:27

答案(点此获取答案解析)

D

同类题5

根据短文内容,选择最佳答案。

    Every people uses its own special word to show its ideas and feelings. Some of these expressions(表达,说法) are commonly used for many years. Others are popular for just a short time. One such American expression is “Where's the beef?” It is used when something is not as good as it is said to be. In the early 1980s “Where's the beef?” was one of the most popular expressions in the United States. It seemed as if everyone using it at the time.

    Beef, of course, is the meat from a cow, and food is more popular in America than a hamburger made from beef. In the 1960s a businessman named Ray began building small restaurants that sold hamburgers at a low price. Ray called this “McDonald's”. Ray became one of the richest businessmen at last in America.

    Other business people watched his success. Some of them opened their own hamburger restaurants. One company called “Wendy's” said its hamburgers were bigger than those sold by McDonald's or anyone else. The Wendy's Company began to use the expression “Where's the beef?” to make people know that Wendy's hamburgers were the biggest. The Wendy's television advertisement showed three old women eating hamburgers. The bread that covered the meat was very big, but inside there was only a bit of meat. One of the women said she would not eat a hamburger with such a little piece of beef. “Where's the beef?” she shouted in a funny way. The advertisement for Wendy's hamburger restaurants was success. As we said, it seemed everyone began using the expression “Where's the beef?”.