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【单选题】
W、X、Y、Z四种短周期元素的原子序数依次增大,W的某种原子无中子,X、Y可形成原子个数之比为1∶1的具有漂白性的物质,工业上常用电解饱和YZ溶液来获得Z的单质及其他产品,下列说法正确的是( )
A.
W和X、Y、Z均能形成18电子的分子
B.
上述四种元素的原子半径大小顺序为r(Z)>r(Y)>r(X)>r(W)
C.
X、Y之间形成的化合物可能同时含有离子键和非极性共价键
D.
W、X、Z三种元素形成的化合物一定是弱酸
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相关题目：
【简答题】A．He does not like to play piano. B．He has to attend many piano lessons. C．He has to enter every piano competition. D．He is afraid of disappointing his parents.
查看完整题目与答案
【单选题】预防病毒感染最有效的方法是（）
A.
使用抗毒素
B.
使用抗病毒化学疗剂
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【判断题】According to Sun Yatsen’saying, there would not have been the prosperity of the Han and Tang dynasties, or the integration of southern and northern peoples without the Great Wall.
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A.
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【判断题】According to Sun Yatsen’ saying, there would not have been the prosperity of the Han and Tang dynasties, or the integration of southern and northern peoples without the Great Wall.
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使用抗毒素
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使用抗病毒化疗药物
C.
使用中草药
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There are many big names at the top of the list.
B.
Tim Gill is the fourth most rich and famous on it.
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Most of the powerful persons listed are homoerotic.
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查看完整题目与答案
【单选题】He has to attend to.
A.
important something
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important anything
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【多选题】Sun Yatsen ever said, “Seen from today, if it had not been for the protection of the Great Wall, Chinese civilization would have been interrupted by the northern peoples in ______________ dynasties, l...
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the late Qin or early Han
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