The contribution of genes make intelligence increase as children grow older. This goes against the notion that most people hold that as we age, environmental influences gradually overpower the genetic legacy we are born with and may have implications for education. "People assume the genetic influence goes down with age because the environmental differences between people pile up in life," says Robert Plomin. "What we found was quite amazing, and goes in the other direction. "
Previous studies have shown variations in intelligence are at least partly due to genetics. To find out whether this genetic contribution varies with age, Plomin’s team pooled data from six separate studies carried out in the US, the UK, Australia and the Netherlands, involving a total of 11,000 pairs of twins. In these studies, the researchers tested twins on reasoning, logic and arithmetics to measure a quantity called general cognitive ability, or "G" . Each st
A. cognitive ability
B. strong heritability
C. genetic legacy
D. challenging pastimes
(四)
背景资料:
某中型机电安装工程项目,由政府和一家民营企业共同投资兴建,并组建了建设班子(以下称建设单位),建设单位X把安装工程直接交予A公司承建(是否应进行公开招标)。上级主管部门予以否定。之后,建设单位公开招标,选择安装单位。招标文件明确规定,投标人必须具备机电工程总承包二级施工资质。
工程报价采用综合单价报价。
经资质预审后,共有A、B、C、D、E五家公司参与了投标。投标过程中(发生了如下事件):
A公司提前一天递交了投标书;
B公司在前一天递交投标书后,在截止投标前10分钟,又递交了修改报价的资料;
D公司在表述密封时未按要求加盖法定代表人印章(废标书);
E公司未按招标文件要求的格式报价(废标书);
经评标委员会评定、建设单位确定,最终C公司中标,按合同范本与建设单位签订了施工合同。(符合资格的5家公司投标,2家公司投的标书为废标,3家公司的标书有效,此次招标有效符合规定)
施工过程中发生下列事件:
事件一:开工后因建设单位采购的设备整体晚到,致使C公司延误工期10天,并造成窝工非及其他经济损失共计15万元;(建设方的原因)
C公司租赁的大型吊车因维修延误工期3天,经济损失3万元(施工方设备管理的原因);
因非标准件和钢结构制作及安装工程量变更,增加费用30万元;(设计变更)
施工过程中遇台风暴雨,C公司延误工期5天,并发生窝工费5万元,施工机具维修费5万元。(不可抗力)
事件二:非标件制作过程中,C公司对成品按要求做外观检查,检查对质检人员用放大镜观察了焊缝是否有咬边、夹渣、气孔、裂纹表明缺陷,并及时进行了修复。但建设单位要求用焊接检验尺进一步检查焊缝的缺陷。
问题:
(二) 某单因子试验,因子A有3个水平,每个水平做5次重复试验,则 |
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