书面表达。

     假如你是市长，你将为大家做些什么？请你以If I were the mayor of our city，I would…为开头，写一篇短文。大约80词左右。

     If I were the mayor of our city, I would _______________________________________________________________________________________________________________________________________________________________________________________________________________

在拧紧圆形或方形布置的成组螺母纹时，必须对称地进行。