第3周期元素的基态原子中，不可能出现1电子，主要依据是（）

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第 3 周期元素的基态原子中，不可能出现 1 电子，主要依据是（　　）

A．能量最低原理

B．近似能级图中的顺序 3d 轨道能量比 4s 轨道高

C．洪特规则

D．泡利不相容原理

答案

选择题

The student said to me, "She has made a close study of the problem."

The student told me that she __ a close study of the problem. [ ]

A. has make

B. have made

C. had make

D. had made

选择题

That's ___________ jeep. It's a car.[ ]

A. a not

B. not

C. not a

D. not an