题目

Though he often made his little sister ______, today he was made ______ by his little sister. A. cry; to cry B. crying; crying C. cry; cry D. to cry; cry 答案：A如图8-1-8所示，一气缸竖直倒放，气缸内有一质量不可忽略的活塞，将一定量的理想气体封在气缸内，活塞与缸壁无摩擦，气体处于平衡状态.现保持温度不变把气缸稍微倾斜一点，在达到平衡后，与原来相比，则(    ) 图8-1-8A.气体的压强变大                                   B.气体的压强变小C.气体的体积变大                                   D.气体的体积变小