如图所示，一定质量的理想气体密封在绝热（即与外界不发生热交换）容器中，容器内装有一可以活动的绝热活塞。今对活塞施以一竖直向下的压力F，使活塞缓慢向下移动一段距离后，气体的体积减小。若忽略活塞与容器壁间的摩擦力，则被密封的气体
A．温度升高，压强增大，内能减少
B．温度降低，压强增大，内能减少
C．温度升高，压强增大，内能增加
D．温度降低，压强减小，内能增加
答案：C
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| Hello. I'm Jack. I'm a boy. I'm 1 Class One, Grade One. Look! This is a picture 2 my classroom. This is my desk. It's 3 to the window. Can you see my backpack? It's 4 my chair. My books 5 on my desk. My pen and pencil 6 in my pencil case. What's that 7 my desk? It's my soccer ball. Do you like my classroom? It's big and bright. There is a map of China 8 the wall. 9 the map, it's a red flag. On the window, 10 many flowers. There is a TV and a computer in our classroom. I like our classroom very much. | ||||
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