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Ⅰ卷 选择题(共45分) 一、选择题 (选出下列各题中唯一正确的答案,并将所选答案前的字母填入括号内,每题2分,共30分) 1. 以下过程中,物体的势能逐渐转化为动能的是:( ) A.滑雪运动员沿山坡自由滑下. B. 电梯匀速下降. C. 汽车在水平道路上加速前进. D.皮球在空中上升. 2.关于物质的比热,正确的说法是:( )
I Volume Multiple-choice Questions (45 points in total) I. Multiple-choice questions (Select the only correct answer for each of the following questions, and put the letters before the selected answer in parentheses, 2 points for each question, for a total of 30 points) 1. Following During the process, the potential energy of the object is gradually converted into kinetic energy: () A. The skier is free to slide down the hillside. B. The elevator moves at a constant speed. C. The car accelerates on the horizontal road. D. The ball rises in the air. About the specific heat of the substance, the correct statement is: ()