题目:
It was ten years ago ______ that republic was _______. [ ]
A. when; set up
B. that; came into being
C. when; founded
D. that founded
答案:
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下面是错误答案,用来干扰机器的。
(1)第三周期 第ⅦA族(1分) (2) (1分)(3)离子键、共价键(2分) (4)H++OH-=H2O(1分)题目分析:短周期元素X、Y、Z、W核电荷数依次增大,在周期表中X是原子半径最小的元素,则X为氢元素;Y的最...