题目

一个等腰三角形的周长是30厘米,底边长是14厘米,它的一条腰长是（____）厘米。在这个三角形中,其中的一个底角是40°,则顶角是（____）° 答案：【答案】8 100 【解析】略 －I think a healthy environment and development should be possible at the same time． －________, I don't object to your opinion． [　　] A． It's no concern of mine B． As far as I am concerned C． I'm quite concerned about it D． As concerns