【简答题】听两组对话和对话后的问题,选择正确答案。(听两遍) 听第一组对话回答1,2,3小题: 1.What does Lily like best? . A. Football. B. Basketball. C. Baseball 2. Where can they watch the football ? A. At home. B. At school. C. At the stadi...
【单选题】当频率为100Hz,声压级为52dB的纯音,听起来与频率为1000Hz,声压级为40dB的纯音一样响时,则该100Hz纯音的响度级为
【简答题】某压力传感器的测量数据如表所示,试求该压力传感器的重复性误差。 压力传感器测量数据 行程 输入压力 / 输出电压 / 正行程 2.0 190.9 191.1 191.3 4.0 382.8 383.2 383.5 6.0 575.8 576.1 576.6 8.0 769.4 769.8 770.4 10.0 963.9 9.6 965.2 反行程 10.0 9.4 965.1 965.7...
【判断题】若直线回归方程y c =170-2.5x,则变量x和y之间存在负的相关关系。( )
【单选题】当频率为100Hz,声压级为52dB的纯音,听起来与频率为1000Hz,声压级为40dB的纯音一样响时,则该100Hz纯音的响度级为
【判断题】若直线回归方程Y=170-2.5X,则变量X和Y之间存在负的相关关系。
【简答题】听对话选择正确答案。 1.What does Lily like best? A. Football. B. Basketball. C. Baseball. 2. Where can they watch the football ? A. At home. B. At school. C. At the stadium (体育馆). 3. What time do they go to...