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第1卷(选择题共30分) 以下每题各只有_个正确答案,选对得2分;多选、错选均不得分. 1.小球由静止沿斜面滚下(不计摩擦).那么,小球的( ). (A)动能转化为势能 (13)势能转化为动能 (C)机械能不断增加 (D)机械能不断减少 2.晶体在熔化的过程中( ). (A)吸热温度升高 (B)放热温度降低
Volume 1 (30 points for multiple-choice questions) Each of the following questions has only _ correct answer, with 2 points for the selected pair; multiple choices and wrong choices are not scored. 1. The ball rolls off from the standstill along the slope (not counting friction). Then, the ball (). (A) The kinetic energy is transformed into potential energy (13) The potential energy is converted into kinetic energy (C) The mechanical energy is increasing (D) The mechanical energy is continuously decreasing 2. The crystal is in the melting process (). (A) Endothermic Increased temperature (B) Reduced exotherm temperature