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一、选择题(每小题2分,共50分,在每小题给出的四个选项中只有一个选项是正确的) 1.国际单位制中力学的基本单位是:( ) A.克、厘米、秒. B.千克、千米、小时. C.千克、米、秒. D.千克、牛、米. 2.对作简谐振动的物体来说,当它通过平衡位置时,下列物理量中具有最大值的是:( ) A.加速度. B.势能. C.动能. D.回复力. 3.光的干涉现象表明: A.光具有粒子性. B.光具有波动性. C.光是纵波. D.光是横波. 4.“闻其声而不见其人”主要是由于声波的:( )
First, the multiple-choice questions (2 points for each question, a total of 50 points, in each question given only one of the four options is correct) 1. The basic unit of mechanics in the international system of units is: () A. grams , Centimeters, Seconds. B. Kilograms, kilometers, hours. C. Kilograms, meters, seconds. D. Kilograms, cattle, meters. 2. For an object that simply vibrates, when it passes through an equilibrium position, the following The maximum values in the physical quantities are: () A. Acceleration, B. Potential energy, C. Kinetic energy, D. Restoring force, 3. Interference of light shows that: A. Light has particle properties. B. Light has fluctuations. C The light is a longitudinal wave. D. The light is a transverse wave. 4. The word “sound but not its person” is mainly due to sound waves: ()