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一、填空题(共30分,第1、2题每空0.5分,第3至15题每空1分) 1.填写下列数值: A.声音在空气中的传播速度:__米/秒;B.水的密度:__;C. 光在真空中的传播速度:__米/秒;D.对于人体的安全电压:__. 2.下列常见的物理现象各属于哪种状态变化: A.严寒的冬天,玻璃窗上结有冰花:__; B.秋天的早晨,草叶上挂满着露珠:__; C. 炎热的夏季,洒在地上的水很快就干了:__;
1. Fill in the blanks (30 points in total, 0.5 points for each of the 1st and 2nd questions, 1 point for each of the 3rd to 15th questions) 1. Fill in the following values: A. Speed of sound propagation in the air: __m/s B. Density of water: __; C. Propagation speed of light in vacuum: __m/s; D. Safe voltage for human body: __. 2. Which of the following common physical phenomena each belong to: Frosty winter, with ice on the glass window: __; B. Autumn morning, the grass is covered with dew: __; C. In the hot summer, the water that sprinkling on the ground quickly dried: __;