【单选题】课程考核平时成绩和期末成绩的占比分别为百分之多少?
【单选题】G71指令格式中第一行的U指的是( )。
【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)
【单选题】G71外圆粗车循环指令格式中,第一行 G71 中的参数 U 指定的是( ),半径值,不带正负号。
【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...