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A．已知A、B、C、D、E是短周期中的五种元素，它们的原子序数依次增大．A和B可形成常见化合物BA 4 ，一个BA 4 分子中电子总数为10；C原子的最外层电子数是核外电子总数的 3 4 ；D与C同一主族，E - 比C 2- 多一个电子层．试回答： （1）D与E两元素相比较，非金属性较强的是______（填元素名称），请你自选试剂设计实验验证该结论（说明试剂、简单操作、实验现象）______； （2）A、C、D间可形成甲、微粒，它们均为负一价双原子阴离子且甲有18个电子，l0个电子，则甲与乙反应的离子方程式为______； （3）由A、B、C三种元素组成的化合物的球棍结构如图：，试写出利用植物秸秆生产这种物质的化学方程式______、______．
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【判断题】资本积累率是指企业本年所有权益增长额同年初所有者权益的比率，它可以表示企业当年资本的积累能力，是评价企业发展潜力的重要指标。()
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相关题目：
【单选题】Who sells what to whom
A.
has been a major preoccupation of int'l economics.
B.
is  not a valid concern of int'l economics.
C.
is determined by political rather than economic factors.
D.
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查看完整题目与答案
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【判断题】资本积累率是指企业本年所有权益增长额同年初所有者权益的比率，它可以表示企业当年资本的积累能力，是评价企业发展潜力的重要指标。()
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B.
why people of one type prefer to isolate themselves from those of another type
C.
peculiar characteristics of people from different countries in choosing living places
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what types of people like to move frequently and why they keep changing their living places
查看完整题目与答案
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A.
the fact that people of different nationalities or ethnical groups reside in different places
B.
why people of one type prefer to isolate themselves from those of another type
C.
peculiar characteristic of people from different countries in choosing living places
D.
what types of people, like to move frequently and why they keep changing their living places
查看完整题目与答案
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A.
1个密码子可以编码多种氨基酸,
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D.
不同的生物采用组成不同的密码子
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AUG仅为起始密码,不编码氨基酸
查看完整题目与答案