下列电子构型中属于原子基态的是( )。
A.1s22s22p54f1 B.1s22p2 C.1s22s12p1 D.1s22s2
参考答案:D
I thought _______ very useful to know the customs of foreign countries.
A.that
B.to coming
C.it
D.to go
()法是指推销人员利用顾客求荣心理,通过赞美顾客而接近顾客的方法。