（3分）A、B、C、X、Y均为初中化学常见的纯净物，它们之间有如下转化关系（部分生成物已略去）。（1）若X和Y 是同种物质，则B为 ；②的反应
______ I can’t fully understand what his music really conveys, his performance is quite impressive. A. While B. Since C. If
质量一定的理想气体被活塞封闭在圆柱形的金属气缸内，活塞与气缸底部之间用一轻弹簧相连接，如图所示．活塞与缸壁间无摩擦而且不漏气．已知，
So you want to have a tarantula(狼蛛)as a pet? You want to join the fastest growing hobby in the US? Read this beginner’s guide to learn the most important facts. What is a tarantula? Tarantula
She parked her car outside the window _______, but the next morning she found it missing. A．as usualB．at leastC．so farD．at all
（08年九江一中期中）一平行板电容器两极板间距为d，与电源连接时，极板间一带电微粒恰好静止，现在把它与电源断开，用绝缘手柄使两极在d与2d间
将4molA气体和2molB气体在2L的容器中混合，并在一定条件下发生如下反应：2A（g）+B（g）2C（g）。若经过2s测得C的浓度为0.6mol/L，现有下列几种说法，其中
下图所示区域在18。S太平洋附近，L示意流经沿岸的洋流。据此完成11〜12题。 11.下图是海洋表层海水温度与洋流关系示意图，图中a、b、c为等温线
