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【简答题】
下表是元素周期表的一部分： 族 周期 IA 0 1 1 H 1．008 ⅡA ⅢA ⅣA V A ⅥA ⅦA 2 He 4．003 2 3 Li 6．941 4 Be 9．012 5 B 10．8l 6 C 12．01 7 N 14．0l 8 O 16．00 9 F 19．00 10 Ne 20．18 3 11 Na 22．99 12 Mg 24．31 13 Al 26．98 14 Si 28．09 15 P 30．97 16 S 32．06 17 Cl 35．45 18 Ar 39．95 请根据上表信息填空： （1）氟元素的相对原子质量为 ，该元素原子的中子数为 （2）原子序数为12的元素属于 （填“金属”或“非金属”）元素，它在反应中容易 （填“得到”或“失去”）电子；F元素最外层电子数为 ，表中与其化学性质相似的元素是___________。 （3）表中不同种元素最本质的区别是 (填序号) A．质子数不同         B．相对原子质量不同       C．电子数不同 （4）某粒子的结构示意图为 ，当x—y＝5（y≠0）时，该粒子的符号为 。
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It has made it easier to fight piracy.
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It has increased the number of pirate CDs available.
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Their business was given away free on the Internet.
B.
They gave CDs away free in shops.
C.
They played free concerts.
D.
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德国
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荷兰
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through CD sales
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by selling merchandise on the Internet
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【单选题】以下哪一项是对一部分人文学者对科学进展迟钝的表现:()
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【单选题】在LM曲线不变的情况下,政府支出的增加会引起收入
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【判断题】在LM曲线不变的情况下,政府支出的增加会引起收入增加,利率上升。()
A.
正确
B.
错误
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【判断题】在LM曲线不变的情况下,政府支出的增加会引起收入增加,利率上升。()
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查看完整题目与答案