已知NH4CuSO3与足量的10mol/L硫酸液混合微热，产生下列现象：①有红色金属生成

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• 1做两样本均数的t检验，当有差别时，t值越大则A、两样本均数差异越大B、两总体均数差异越大C、越有理由

  做两样本均数的t检验，当有差别时，t值越大则

  A、两样本均数差异越大

  B、两总体均数差异越大

  C、越有理由认为两总体均数不同

  D、越有理由认为两样本均数不同

  E、两样本均数差异越小

  请帮忙给出正确答案和分析，谢谢！

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• 2一定温度下,可逆反应2SO2+O2==2SO3达到平衡时,三者物质的量之比为2：3：4.现在缩小体积
  一定温度下,可逆反应2SO2+O2==2SO3达到平衡时,三者物质的量之比为2：3：4.现在缩小体积,反应再次达到平衡时,氧气物质的量为0.8mol,三氧化硫物质的量为1.4mol,此时二氧化硫物质的量是多少?
  
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• 3【C8】A．desirableB．plausibleC．commendableD．remarkable

  【C8】

  A．desirable

  B．plausible

  C．commendable

  D．remarkable

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• 4【C5】A．generallyB．vividlyC．fluentlyD．accurately

  【C5】

  A．generally

  B．vividly

  C．fluently

  D．accurately

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• 514题对吗,还有15题我数的12种
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• 6A facial expression results from one or more motions or positions of the muscles of the fa

  A facial expression results from one or more motions or positions of the muscles of the face. These movements【C1】______ the emotional state of the individual to observers. Facial expressions are a form. of nonverbal communication. They are a【C2】______ means of expressing social information among humans, but also occur【C3】______most other mammals and some other animal species. Facial expressions and their significance in the【C4】______ can, to some extent, vary between cultures. Peoples expressions are often shaped by artists. Through this method, ones spirit can be showed【C5】______. Humans can【C6】______a facial expression as a voluntary action. However, because expressions are closely【C7】______ to emotion, they are more often involuntary. It can be nearly impossible to avoid expressions for certain emotions, even when it would be strongly【C8】______to do so: a person who is trying to avoid【C9】______ to an individual he or she finds highly unattractive might【C10】______ show a brief expression of disgust before being able to reassume a【C11】______ expression. The close link between emotion and expression can also work in the other direction.【C12】______some researchers have observed in some cases, voluntarily assuming an expression can actually cause the associated emotion. Some expressions can be accurately【C13】______ even between members of different species—anger and extreme contentment【C14】______ the primary examples. Others, however, are difficult to understand even in familiar individuals. For instance, disgust and fear can be tough to tell【C15】______. Because faces have only a limited range of movement, expressions【C16】______fairly minuscule differences in the proportion and relative position of facial features, and reading them requires considerable【C17】______. Some faces are often【C18】______ read as expressing some emotion, even when they are neutral, because their proportions naturally【C19】______ those another face would【C20】______assume when emoting.

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  A．convert

  B．convey

  C．conduct

  D．confine

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• 7高中化学…7.8.9求分析和正解,答案请带分析,谢谢…
  高中化学…7.8.9求分析和正解,答案请带分析,谢谢… 
  
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• 8（做的不知对错,要求每题解答） 7.8.9.
  （做的不知对错,要求每题解答） 7.8.9. 
  
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• 9The example of Brazilians is to show that______.A．Brazilians are really crazy about footba

  The example of Brazilians is to show that______.

  A．Brazilians are really crazy about football

  B．the energy they generate could be better used

  C．victory and defeat are both common in battles

  D．they should spend more time on football

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• 10下列有关实验的评价正确的是（　　）A. 点燃某可燃物，在火焰上罩一个冷而干燥的烧杯，烧杯的内壁有水雾
  下列有关实验的评价正确的是（　　）A. 点燃某可燃物，在火焰上罩一个冷而干燥的烧杯，烧杯的内壁有水雾出现，证明可燃物一定是H2或含有H2B. 某混合气体能使灼热的氧化铜变成红色固体，且导出后气体能使澄清石灰水变浑浊，证明原气体中一定含有一氧化碳，C. 实验室用大理石与盐酸反应制取的CO2通入澄清石灰水无沉淀生成，可能是因为盐酸太浓D. 含二氧化碳、一氧化碳、氢气、水蒸气、氮气的混合气体，依次通过石
  
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