植树造林的意义
1个回答
植树造林还能减少噪音,美化环境,保持生态平衡,为人类提供理想的学习、工作、娱乐和生活的场所.自动的调温器 夏日树荫下气温比空地上低10度左右,冬季又
最新问答： 质量为m=100g的木块,放在动摩擦因数为μ=0.5的水平桌面上,受到俩个与桌面平行,大小均为10N,互成60°角的公点 爬山虎的脚要是没触着墙,不几天就萎了,后来连痕迹也没有了.这句话的作用是 用英语怎么说"患难见挚交"? usually are they very after class tired连词成句 英语方位词 春秋战国,晋文公大败楚庄王的启示 i think my cousin and his parents _____ (have)a good time in 已知等比数列an中a1=1,公比为x(x〉0)其前n项和为Sn,bn=an/Sn,求lim(n→○○)bn Afternoon tea is ___ in the diningroom from 3 to 5 pm every 终点相同,如果在同一条起跑线上,外圈的同学跑的距离（）,所以外圈跑道的起跑线位置应该往（）移. 字迷：只走一半 ——? 在△ABC中，角A，B，C所对的边分别是a，b，c，a2+c2−b2＝12ac． Mr. Green, a famous writer, ______ our school last month. A． knock into ,knock down Like the mountain climber who stops now and then to e___ the A/3cos2x怎么化简? 英语攺正错句!I has got a two pen.He have got an pen.I doesn't like （2011•宜昌模拟）用数字和符号表示： 1.一只兔子和一只跑地很快的乌龟比赛跑步谁赢了?乌龟,因为已经说了它是跑的很快的了. 抛物线y=-x2-2x+m，若其顶点在x轴上，则m=______．
