【简答题】砌墙的石头歇后语

【判断题】文字及符号相交

【简答题】There was once a man called Mr. Flowers, and flowers were his only joy in life. He spent all his spare time in one of his four glass-houses and grew flowers of every color, with long and difficult nam...

【多选题】石头压碎值的题 选（ ），

【简答题】什么东西不怕布，只怕石头？

【单选题】石头∶钻石

【单选题】所谓符号就是（）

【简答题】已知函数f（x）=-x-x3，x1，x2，x3∈R，且x1+x2>0，x2+x3>0，x3+x1>0， 则f（x1）+f（x2）+f（x3）的值的符号一定是（ ）。

【单选题】为GTO符号

【单选题】摸着石头过河