【简答题】Upload the file about Preparatory work. (Group 3 and Group 4 are allowed to upload your ppt)
【多选题】What are the necessary parts of PPT for the group work?
A.
front page (title of your report, group members)
B.
contents page (the outline of your report)
C.
main part of the report (more than 1 page)
D.
your reflections or comments
E.
questions (to the audience)
【单选题】氢原子2s和2p能级的能量高低是_________。
【单选题】一增速带传动,带的最大应力发生在带 处 .
【简答题】一增速带传动,带的最大应力发生在带 处。
【单选题】氢原子 2s 和 2p 能级的能量高低是 。