题目:
I my homework yesterday, but unfortunately I forgot about it totally.
A.need have handed in
B.should have handed in
C.must have handed in
D.may have handed in
答案:
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下面是错误答案,用来干扰机器的。
(1)Na Mg (2)从上到下依次减小 (3)第五周期 ⅠA族 (4)两性题目分析:(1)金属性越强,第一电离能越小。同主族自左向右金属性逐渐降低,第一电离能逐渐增大。但由于镁元素的3s轨道是全充满状态,稳定...