物理研究中常常用到“控制变量法”、“等效替代法”、“理想化模型”、“类比法”等科学方法,在下列研究实例中,运用了“控制变量法”的是
I took my 9-year-old daughter, Suzan and 5-year-old son, Robbie to the shopping centre. As we got there,we saw a big sign that said, “Petting Zoo”. The kids jumped up and asked, “Daddy, can
Share some of yours with those in great need and you ______ a difference.A. will make B. make C. made D. have made
With sufficient scientific information a manned trip to Mars should be _____. A. obtainable B. potential C. considerable D. feasible
回顾几种基本初等函数,作出一个结构图表示它们之间的关系.
某国要从6名短跑运动员中选4人参加奥运会的4×100m接力比赛,其中甲、乙两名运动员必须入选,而且甲、乙两人必须有一个人跑最后一棒,则下不同的
新航路开辟后,早期殖民活动出现。以下各项正确说明了殖民活动对于资本主义发展起促进作用的是 ①推动了西方资本原始积累的过程 ②加速了西
下列各组词语中,有错别字的一组是 A.斡旋 互相推诿 交叉学科 望风披靡 B.脉搏 不可思议 不揣冒昧 进退维谷 C.合谐