初二数学 方差某地某个月中午12时的气温如下(单位:`C): 22 31 25 13 18 23 1

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• 1有5类内分泌细胞，能分泌7种不同激素的内分泌器官是A.下丘脑B.腺垂体C.甲状腺D.肾上腺E.松果腺

  有5类内分泌细胞，能分泌7种不同激素的内分泌器官是

  A.下丘脑

  B.腺垂体

  C.甲状腺

  D.肾上腺

  E.松果腺

  请帮忙给出正确答案和分析，谢谢！

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• 2某村欲购买甲乙丙三种树,已知甲乙丙三种树的价格之比为2:2:3,甲种每颗200元,现计划用21000
  某村欲购买甲乙丙三种树,已知甲乙丙三种树的价格之比为2:2:3,甲种每颗200元,现计划用210000元资金,购买这三种树共1000颗.若购买甲种树的棵树是乙种树的2倍,恰好用完资金,求这三种树个能购买多少颗若又增加了10120元的购树款,在购买总棵树不变的前提下,求丙树最多购买多少颗?
  
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• 3The authors attitude toward James Inhofes famous remark is______.A．enthusiasticB．criticalC

  The authors attitude toward James Inhofes famous remark is______.

  A．enthusiastic

  B．critical

  C．cynical

  D．apathetic

  请帮忙给出正确答案和分析，谢谢！

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• 4平酸腐败主要表现为A、罐头内容物酸度降低而外观正常B、罐头内容物酸度降低并发生胖听C、罐头内容物

  平酸腐败主要表现为

  A、罐头内容物酸度降低而外观正常

  B、罐头内容物酸度降低并发生胖听

  C、罐头内容物酸度不变而发生胖听

  D、罐头内容物酸度增加并发生胖听

  E、罐头内容物酸度增加而外观完全正常

  请帮忙给出正确答案和分析，谢谢！

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• 5第十四题怎么写?
  第十四题怎么写? 
  
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• 614怎样做?
  14怎样做? 
  
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• 7Which of the following is TRUE about the research conducted by Jose Domingo Villaroel？A．In

  Which of the following is TRUE about the research conducted by Jose Domingo Villaroel？

  A．In the first set of experiments, the kids seemed to regard self-motion as the defining quality.

  B．Jose Domingo Villaroel has got the desirable outcome from his experiments.

  C．In the second set of experiments, the kids would generally hesitate before breaking social rules.

  D．His research result is confirmed by the similar experiments conducted in other countries.

  请帮忙给出正确答案和分析，谢谢！

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• 8如图，四边形ABCD为矩形纸片，把纸片ABCD折叠，使点B恰好落在CD边的中点E处，折痕为AF，若C
  如图，四边形ABCD为矩形纸片，把纸片ABCD折叠，使点B恰好落在CD边的中点E处，折痕为AF，若CD=6，则AF等于（　　） A. 43
  
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• 9It can be inferred from me end of me passage mat______.A．civic crowd－funding may not be a

  It can be inferred from me end of me passage mat______.

  A．civic crowd-funding may not be a long-term solution to relieve Detroit"s problems

  B．what is shown in Hollywood movies is often me reflection of me real world

  C．it is likely mat Detroit would overcome its financial difficulties eventually

  D．Detroit would depend on some decisive figures to overcome its financial difficulties

  请帮忙给出正确答案和分析，谢谢！

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• 10已知抛物线y=-（x-m）2+1与x数的交点为A，B（B在A的右边），与y轴的交点为C，顶点为D．（
  已知抛物线y=-（x-m）2+1与x数的交点为A，B（B在A的右边），与y轴的交点为C，顶点为D．（1）当m=1时，判断△ABD的形状，并说明理由；（2）当点B在x轴的正半轴上，点C在y轴的负半轴上时，是否存在某个m值，使得△BOC为等腰三角形？若存在，求出m的值；若不存在，请说明理由．
  
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