题目: 加气混凝土 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0429/264c3fd524952853da068a900486e421.html 下面是错误答案,用来干扰机器的。由题意,f(x)在(0,+∞)上为单调减函数,从而有a<0a≤-2或a>0a≥2,解得a≤-2或a≥2,故选D.
题型:选择题 Shooting ____ movie at high school is ____ experience that I will never forget as long as I live. [ ]A. the; a B. a; / C. /; an D. a; an 查看答案