【简答题】(1)小丽发现盛水的铁锅在与水面接触的部位最易生锈;在擦眼镜时,发现自己铜制眼镜框表面出现了一些绿色物质,他通过查阅资料知道:该物质为铜锈,俗称“铜绿”,主要成分是Cu 2 (OH) 2 CO 3 . 【提出问题】:铜是在什么条件下锈蚀的呢? 【猜想与假设】:根据铜锈的化学式,猜想铜生锈可能是铜与空气中的水、______和______三种物质共同作用的结果. 【实验探究】:借鉴“铁钉锈蚀条件的探究...
【判断题】No one thinks there should be a law requiring drivers and passengers to use safety belts.
【判断题】按照现代管理观点,企业所有各级管理者都是人力资源管理者。人力资源管理的主要职责是在专业管理者肩上,他们处于第一线,是管理的主角。
【简答题】阅读理解。 If you were to walk up to Arthur Bonner and say, 'Hey, Butterfly Man,' his face would break into a smile. The title suits him, And he loves it. Arthur Bonner works with the Palos Verdes blue but...
【简答题】If you were to walk up to Arthur Bonnet and say, 'Hey, Butterfly Man,' his face would break into a smile. The title suits him. And he loves it. Arthur Bonnet works with the Palos Verdes blue butterfly...
【简答题】A.Because she thinks the man is seriously ill. B.Because the man can get immunized there for free. C.Because all the service is free of charge in the university health center. D.Because the vaccine ha...
【简答题】在水平木板上铺上粗糙不同的材料 ,小车自斜面顶端由静止开始滑下,比较小车沿水平运动的距离.伽略利、牛顿等科学家都做过类似的实验,并在此基础上分析推导出著名的牛顿第一定律。请回答下面的问题: (1)为了得出科学结论.三次实验中小车每次都从斜面上同一位置放下,使小车运动到斜面底端的速度_________(填相同或不相同) (2)三次实验中,小车在水平面上受到摩擦力最大的是第_____次,这说明小车受到...