Lin Da has decided to__________
A. invite Prof. Green to attend her wedding ceremony
B. decline the present Prof. Green's going to give her
C. buy Prof. Green a nice present to express her thanks
D. find a present together with Prof. Green
查看答案
Which of the following is TRUE?
A. Prof. Green is surprised to see Lin Da’s husband.
B. Prof. Green has almost forgotten Lin Da.
C. Lin Da is going to be a bride next month.
D. Prof. Green has decided to buy an expensive gift for Lin Da.
下列各对元素中，性质差异最大的是
A. Nb和Ta
B. Ti和V
C. Zr和Hf
D. Mo和W
下列元素中，基态原子的第一电离能最小的是
A. N
B. Cl
C. O
D. S
在第四周期的原子中，具有1个未成对电子的元素有
A. 2种
B. 3种
C. 4种
D. 5种
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