已知函数$f\left(x\right)=\left\{\begin{array}{c}\left|\ln \left|x\right|\right|\left(x\ne 0\right)\\ 0\left(x=0\right)\end{array}\right.$，则方程$f^2\left(x\right)-f\left(x\right)=0$的不相等的实根个数为（    ）

    It is the world's most well-known and popular song. It has been sung hundreds of millions of times each year. It has been heard in outer space, at baseball stadiums, in movies and in domiciles(住处)from the White House to the most remote(遥远的) backwoods shack(窝棚) in Misissippi. It has been wired into millions of music boxes, greeting cards, watches, toys, games and other tune-playing products. And it is the only song in the English language to make people of all ages smile and sing along. The song, of course, is Happy Birthday to You".

    This amazing song began its life in 1893. Written by two sisters from Kentucky, Mildred and Patty Hill, it was originally (起初) named “Good Morning to All”, and intended as a classroom greeting from teachers to students:

    Good morning to you

    Good morning to you

    Good morning, dear children

    Good morning to all.

    To this day, no one knows for sure who wrote the new words to Hill's melody(旋律),or exactly when it happened. “Happy Birthday to You” first appeared in a songbook in1924.The words were presented as the second stanza(节) to "Good morning to You".

中国正以自信的大国形象屹立于世界。阅读下列材料，回答问题。

材料一：60多年前，亚非29个国家和地区领导人出席了万隆会议，形成了团结、．友谊、合作的万隆精神，……亚非国家加强互利合作，能产生“一加一大于二”的积极效应。

──2015年4月22日***在亚非领导人会议上的讲话

材料二：中国把自己的事办好，保持合理的发展，本身就是对世界巨大的贡献。而且中国还在越来越多的承担相应的国际责任和义务。  

──2015年3月15日***答记者问

材料三：

金属R投入稀硫酸中，有气泡产生，镁条插入R的硫酸盐溶液中，有R析出，则R、Mg、Cu的金属活动顺序是（  ）