【简答题】What does the word 'science' in "The Science of Macroeconomics" mean? What is "science" or what is not "science"? (请上传语音)
【简答题】小明发现:水滴可使平行光发生如图(1)(2)所示的变化,且水滴变凸,其焦距 (变小/不变/变大).把写有“爱物理”字样的纸条先后放在左右两水滴下方的桌面上,小明从水滴上方看到的像如图(3)、(4)所示,这种放大功能类似于 (放大镜/投影仪),且水滴变凸,其放大功能 (变小/不变/变大). 列文虎克当年也有类似发现,他制作玻璃球以观察青蛙卵.用高温火焰加热玻璃棒的一端使其熔化,熔化过程中温度变化如图...
【单选题】What is the author's attitude toward science?
A.
He is confident though he is aware of the enormous difficulties in scientific research.
B.
He is doubtful because of the enormous difficulties in scientific research.
C.
He is depressed because of the ignorance of scientists.
D.
He is delighted because of the illuminating scientific findings.
【简答题】某学习小组同学用图中光具座“探究凸透镜成像规律”。 (1)他们按图组装各种器材后,点燃蜡烛后应先调节烛焰、凸透镜和光屏三者的中心大致在同一高度。 (2)实验小组依次选取了不同的物距分别进行实验,同时记录下相关实验数据和观察到的成像情况,如下表: (3)分析表中数据可知:当物距大于2倍焦距时,凸透镜成 像; (4)如果将蜡烛移动到离凸透镜15cm处,凸透镜所成的是 像; (5)若烛焰、凸透镜、光屏分...