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【简答题】
氢气还原氧化铜所得的红色固体可能是铜与氧化亚铜的混合物，已知Cu 2 O在酸性溶液中可发生自身氧化还原反应，生成Cu 2+ 和Cu。 （1）现有8.4克氧化铜被氢气完全还原后，得到红色固体6.96克，其中含单质铜与氧化亚铜的物质的量之比是 ； （2）若将6.96克上述混合物与足量的浓硝酸充分反应： ①生成标准状况下1.568升的气体（不考虑NO 2 的溶解，也不考虑NO 2 与N 2 O 4 的转化），则该气体的成分是 ，其物质的量之比是 ； ②把得到的溶液小心蒸发浓缩，把析出的晶体过滤，得晶体20.328g。经分析，原溶液中的Cu 2+ 有20%残留在母液中，所得晶体的化学式为 。 （3）Cu、Cu 2 O和CuO组成的混合物，加入100mL 0.6mol/L HNO 3 溶液恰好使混合物完全溶解，同时收集到224mL NO气体(标准状况)。如原混合物中Cu的物质的量为X，求其中Cu 2 O、CuO的物质的量及X的取值范围(写出解题过程)。
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【单选题】By stating 'I could have had my eyes closed' the author means (Line 7, Para. 3, last sentence) ______.
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the third baseman would rather sleep than play the game
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the author could close his eyes without watching the game, because it was always the same.
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【单选题】Of the following people, who are not involved in the program?
A.
Cisco System employees.
B.
Advice nurses in the clinic.
C.
Doctors at three local hospitals.
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【单选题】The underlined sentence in Para. 7 roughly means that the researchers believe that ______.
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mutated genes have a negative influence on Ashkenazim's intelligence
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相关题目：
【单选题】The first sentence in para. 7 is the topic sentence of____.
A.
para. 7
B.
paras. 7-8
C.
paras. 7-9
D.
paras. 7-10
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【单选题】______ is most frequently used for employees who are involved in physically producing a product.
A.
Graphic Rating Scales
B.
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C.
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【单选题】Of the following people, who are not involved in the program?
A.
Cisco System employees.
B.
Advice nurses in the clinic.
C.
Doctors at three local hospitals.
D.
Oracle executives.
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【单选题】By stating 'I could have had my eyes closed' the author means (Line 7, Para. 3, last sentence) ______.
A.
the third baseman would rather sleep than play the game
B.
the author could close his eyes without watching the game, because it was always the same.
C.
the third baseman is no good at baseball that he could finish the game with eyes closed all the time and do his work well
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the consequence was too bad he could not bear to see it
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【单选题】Of the following people, who are not involved in the program?
A.
Cisco System employees.
B.
Advice nurses in the clinic.
C.
Doctors at three local hospitals.
D.
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【单选题】The underlined sentence in Para. 7 roughly means that the researchers believe that ______.
A.
mutated genes have a negative influence on Ashkenazim's intelligence
B.
mutated genes have played a role in Ashkenazim's intelligence
C.
the Ashkenazim's high intelligence is caused by the mutated genes
D.
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【单选题】侧面小角度中间画绘制方法的最后一个步骤关键是看（）。
A.
结构准确、动作合理、线条流畅
B.
有无杂点、脏点
C.
动画纸是否固定
D.
线条重叠以后颜色是否够统一
查看完整题目与答案
【判断题】实战姿势正确与否对起动、移动和进行进攻与防守时的距离、时机等产生重要影响。
A.
正确
B.
错误
查看完整题目与答案
【单选题】在 “ 资产 = 负债 + 所有者权益 ” 这一会计恒等式的右端,两个因素的位置 ( ) 。
A.
不能颠倒
B.
可以颠倒
C.
没有顺序要求
D.
在一定条件下可以颠倒
查看完整题目与答案
【简答题】What have researchers compared the sense of technological dependency to? (Para. 7) They have compared it to__________________________.
查看完整题目与答案