下列物质中具有反磁性的是 （1/2/3）：（1）O2（2）He2+（3）[Ni(CN)4]2-
下列物质中具有反磁性的是 （1/2/3）：（1）O2（2）He2+（3）[Ni(CN)4]2-
根据分子轨道理论,He2分子不能形成,但He2+离子可稳定存在。
根据分子轨道理论,He2分子不能形成,但He2+离子可稳定存在。
下列离子中，不具有顺磁性的是( )。 A: NO+ B: O2+ C: N2+ D: He2+
下列离子中，不具有顺磁性的是( )。 A: NO+ B: O2+ C: N2+ D: He2+
根据分子轨道理论，下列分子或离子不可能存在的是（ ）。 A: Be2 B: B2 C: He2+ D: O22+
根据分子轨道理论，下列分子或离子不可能存在的是（ ）。 A: Be2 B: B2 C: He2+ D: O22+
Section C Conversation 2 18.____________________________ A: He is on sick leave. B: He is at a meeting. C: He is on business trip. D: He is on vacation.
Section C Conversation 2 18.____________________________ A: He is on sick leave. B: He is at a meeting. C: He is on business trip. D: He is on vacation.
智慧职教: He from among his friends as he is 2 meters tall.
智慧职教: He from among his friends as he is 2 meters tall.
It was ( ) 2 years after he arrived in London that he found a job in an international bank.
It was ( ) 2 years after he arrived in London that he found a job in an international bank.
根据分子轨道理论,下列分子或离子不可能存在的是(<br/>)。 A: B2 B: He2+ C: Be2 D: O22+
根据分子轨道理论,下列分子或离子不可能存在的是(<br/>)。 A: B2 B: He2+ C: Be2 D: O22+
2) He ' behaved ' like a gentleman.
2) He ' behaved ' like a gentleman.
Conversation 2 What happened to the man A: He fell ill. B: He lost his dog. C: He slept badly.
Conversation 2 What happened to the man A: He fell ill. B: He lost his dog. C: He slept badly.