He’s watching TV? He’s ________ to be cleaning his room.
A) known B) supposed C) regarded D) considered
第1题:
A、his
B、him
C、he
D、he's
第2题:
第3题:
He2的分子轨道表达式为:
A.[ (σ1s )1(σ*1s )1 ]
B.[ (σ1s )2(σ*1s )1]
C.[ (σ1s )2(σ*1s )2]
D.[ (σ1s )2(σ*1s ) 2(σ2s )1]
第4题:
A、doubt whether
B、doubtful
C、doubt it
D、doubtful whether
第5题:
下列原子或离子的核外电子从基态激发到2s或2p轨道,所需能量相同的是 ? ①H , ②He , ③He+, ④Li2+