在一定的温度下,对于反应2A(g)+B(g)2C(g)在反应过程中C的物质的量 n (C)随着时间变化关系如图所示,现从 t 1 时间开始对反应体系升高温度, n (C)的变化如图所示。试回答下列问题: (1)p点时反应的 v 正 ____ v 逆 (选填“>”、“<”或“=”)。 (2)此反应的正反应为____热反应(填“放”或“吸”)。 (3)a、b两点的正反应速率: v a ____v b (“>”、“<”或“=”)。
【简答题】读一读,选词填空。 1. This is a girl (boy, girl). 2. I'm a ________ (girl, boy). 3. This is a ________ (teacher, boy). 4. We are ________ (friends, sad). 5. This is a ________ (student, teacher). 6. I sit besi...
【简答题】句型转换。 1. The boy started playing football in 2004. (就画线部分提问) _______ ________the boy _______playing football? 2. They stayed in Beijing for 5 years .(就画线部分提问) _______ _______ _______ they _______in Be...
【简答题】句型转换。 1. The boy was walking down the street when the UFO landed. (改为同义句) __________ the boy was walking down the street , the UFO __________. 2. How nice the weather is! (改为同义句) __________ _________...