【简答题】an objective, a purpose g___l
【单选题】根据分子轨道理论下列各物质稳定性次序正确的是
A.
O 2 + > O 2 > O 2 - > O 2 2-
B.
O 2 + > O 2 - > O 2 > O 2 2-
C.
O 2 + > O 2 > O 2 2- > O 2 -
D.
O 2 + > O 2 2- > O 2 > O 2 -
【单选题】According to the text, what is the ultimate purpose of virtual reality in education?
A.
To give special students a chance to experience life in the outside world.
B.
To train teachers to work with students with special needs.
C.
To allow special students to learn life-skills in a safe environment.
D.
To prepare special students to transition into mainstream society.
【简答题】根据分子轨道理论: (1)写出O 2 + 、O 2 、O 2 - 、O 2 2- 的分子轨道电子排布式; (2)根据键级排列出稳定性大小顺序; (3)推断分子或离子是顺磁性还是抗磁性。
【简答题】根据分子轨道理论说明: (1) He 2 分子不存在; (2) N 2 分子很稳定,且具有反磁性; (3) O 2 - 具有顺磁性。
【简答题】根据分子轨道理论: ( 1 )写出 O 2 2+ 、 CO 、 NO + 、 O 2 2- 的分子轨道电子排布式; ( 2 )根据键级排列出稳定性大小顺序; ( 3 )推断分子或离子是顺磁性还是抗磁性。
【多选题】理想是否合理、进步与科学的判断标准是()
【单选题】The purpose of the overall vision is to______.
A.
collect as much information as possible
B.
gather all the developers
C.
automate our life in a innovational way
D.
improve the operation of Microsoft