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【简答题】
有X、Y、Z三种元素，它们的原子核内质子数都不超过18，它们之间相互可形成X 2 Z型和YZ 2 型的化合物，已知X + 离子、Y原子和Z原子的电子层数相同，Z原子的最外层电子数是次外层的3倍，Y显最高价态，则： (1)写出各元素的元素符号：X_________、Y_________、 Z________。 (2)X 2 Z的化学式是_________。
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反馈参考答案：
举一反三
【单选题】“对一个国家来讲,就要有民气;对一个队伍来讲,就要有士气;对一个人来讲,就要有志气。有了这三股气,就没有战胜不了的困难。会战职工正是凭着这股劲,高水平、高速度拿下大油田,真正为国争了光,为民族争了气。”这段话提到的大油田是哪个油田:
A.
大庆油田
B.
玉门油田
C.
胜利油田
D.
长庆油田
【单选题】以下哪项不属于组织执行力的特征?( )
A.
组织执行力是组织各项能力的综合性表述
B.
组织的执行力强弱与组织发展结果密切相关
C.
组织执行力是在组织成长发展过程中逐步培育形成
D.
组织执行力不存在于组织与群体、个体之中
【单选题】Hundreds of young people joined in digging at Masada because______.
A.
they were highly paid
B.
they were pure followers of the belief
C.
they wanted to prove the story was true
D.
they respected Yadin very much
【简答题】酒店法律关系的内容是什么?
【单选题】By choosing to go into business for himself, Jim Lazar foregoes the possibility of getting a highly paid job with a large company. This is called a(n):
A.
Sunk cost.
B.
Out-of-pocket cost.
C.
Opportunity cost.
D.
Joint cost.
【单选题】A controversy erupted in the scientific community in early 1998 over the use of DNA (deoxyribonucleic acid) fingerprinting in criminal investigations. DNA fingerprinting was introduced in 1987 as a me...
A.
would have to leave their fingerprints for further investigations
B.
could easily escape conviction of guilt
C.
would have to submit evidence for their innocence
D.
could be convicted of guilt as well
【单选题】“对一个国家来讲,就要有民气;对一个队伍来讲,就要有士气;对一个人来讲,就要有志气。有了这三股气,就没有战胜不了的困难。会战职工正是凭着这股劲,高水平、高速度拿下大油田,真正为国争了光,为民族争了气。”这段话是谁说的:( )
A.
B.
C.
D.
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