Louis Armstrong had two famous nick names. Some people called him Bagamo. They said his mouth looked like a large bag，Musicians often called him Pops，as a sign of respect for his influence on th
下列图像分别表示有关反应的反应过程与能量变化的关系据此判断下列说法中正确的是A．石墨转变为金刚石是吸热反应B．白磷比红磷稳定C．S(g) ===S(s)
在被子植物的一生中，对维持染色体数目恒定和促进植物遗传物质的重新组合起关键作用的环节是 A．受精作用和种子萌发 B．开花和传
―I have lost the cellphone my brother bought me as my birthday present. How careless I was!―Bad luck! Then you have to buy tomorrow we are going shopping together i
若|a|=5，|b|=3，（1）求a+b的值；（2）若|a+b|=a+b，求a﹣b的值．
在下面的横线上再续写两句话，组成一段文意贯通的文字。 生活中的许多情况，是应该用辨证的眼光来看待的。虽然我们说“失败乃成功之母”，但有
甲醇(CH3OH)有毒，误饮可使眼睛失明，甚至死亡。最新研究证明用氨气(NH3)处理含有甲醇的工业废水，可转变为无毒的物质，反应的化学方程式为：5CH3OH
—___________? —He is Andy’s father. A. How is he B. Where is he C. Who is he D. What is he
有平方根的x的取值范围是 。 