下列递变规律正确的是_刷题宝

题干

下列递变规律正确的是（）

A：O，S，Na、K的原子半径依次增大

B：Na、Mg、Al、Si的金属性逐渐增强

C：HF，HCl、H₂S，PH₃的稳定性依次增强

D：KOH，Ca（OH）₂、Mg（OH）₂、Al（OH）₃的碱性逐渐增强

上一题下一题 0.0难度选择题更新时间:2016-07-11 03:02:25

答案(点此获取答案解析）

A

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等于（　　）

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Mike: What did you do, Tom?

Tom: ____ I stayed at home.

Mike: Oh, I'm sorry. ____

Tom: Thank you.

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f (x) = {\begin{matrix} 2 - {(\frac{1}{3})}^{x}, x \leq 0 \\ \frac{1}{2} x^{2} - x + 1, x > 0 \end{matrix}

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下列关于植物组织培养的叙述，错误的是（）

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选出你所听到的词语（）

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