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[背景资料]某高速公路跨线大桥(7×20m+65m+7×20m+5×20m)引桥上部结构为预应力钢筋、混凝土箱梁，后张法施工，采用预制吊装施工工艺。预制场布设在桥位附近荒地，地势平坦，承包人根据工期要求设置10个预制台座，预制场整平压实后，浇筑台座混凝土，抹光整平检验合格后预制箱梁。为防止箱梁预拱度出现偏差，承包人严格控制模板施工质量和立模高程；严格控制张拉时箱梁混凝土强度和存梁时间。箱梁预制过程中主要检验了箱梁混凝土强度和箱梁几何尺寸，以确保梁体质量，箱梁达到规定强度后移至存梁区，箱梁按两层水平存放，层与层之间支垫枕木。为加快工程进度，该大桥承包人报监理工程师批准并于业主认可后将部分箱梁移运、安装工程分包给具有相应资质的分包人，并签订分包合同。为保证箱梁的安装质量，主要检验了箱梁安装竖直度和箱梁顶面纵向高程。安装过程中发生了1片箱梁掉落地面的事故，幸未造成人员伤亡和设备损坏。该片箱梁经检查后作报废处理，直接经济损失约6万元人民币，承包人将事故报告监理工程师，经同意后继续施工。问题： 补充箱梁预拱度偏差的防治措施。预制箱梁主要检验内容遗漏哪几项存梁分层存放时枕木应支垫在箱梁什么位置
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[背景资料]某二级公路工程K30+200～K30+500，地势平坦，路基断面形式为路堤，路堤边坡高度平均22.3m，路基填料为2公里外的路堑挖方，调运过来填筑，拟采用机械化施工。施工单位施工组织设计中路基填筑的施工方案如下：(1)土质分析：借土土质主要为砂性土，各项指标符合要求，作为筑路材料较好。(2)路基填筑：先进性基底处理，然后确定分层的松铺厚度，水平分层填筑，分层压实，每层填土宽度等于填层设计宽度。(3)压实施工：由于土质为砂性土，采用振动压路机进行压实，碾压前对填土层的松铺厚度、平整度和含水量进行了检查，在最佳含水量±2%范围内压实。碾压机械的行驶速度最大不超过4KM/h；碾压式直线段由两边向中间，横向接头的轮迹有0.4～0.5m重叠部分。压实度大于等于94%。问题： 为了检测该路段的压实度，路基土的现场密度的测定方法有哪些
[背景资料]某二级公路工程K30+200～K30+500，地势平坦，路基断面形式为路堤，路堤边坡高度平均22.3m，路基填料为2公里外的路堑挖方，调运过来填筑，拟采用机械化施工。施工单位施工组织设计中路基填筑的施工方案如下：(1)土质分析：借土土质主要为砂性土，各项指标符合要求，作为筑路材料较好。(2)路基填筑：先进性基底处理，然后确定分层的松铺厚度，水平分层填筑，分层压实，每层填土宽度等于填层设计宽度。(3)压实施工：由于土质为砂性土，采用振动压路机进行压实，碾压前对填土层的松铺厚度、平整度和含水量进行了检查，在最佳含水量±2%范围内压实。碾压机械的行驶速度最大不超过4KM/h；碾压式直线段由两边向中间，横向接头的轮迹有0.4～0.5m重叠部分。压实度大于等于94%。问题： 指出施工单位施工方案的错误之处并改正。
一次运动会，A班参加人数和j5}班参加人数之比为5：4，C班参加人数和D班参加人数之比为25：9．A班参加人数与D班参加人数之比为10：3，如果C班参加人数有50人，则A班参加人数有( )．
Technology has been an encouragement of historical change. It acted as such a force in Eng-land beginning in the eighteenth century, and across the entire Western World in the nineteenth.Rapid advances were made in the use of scientific findings in the manufacture (制造) of goods,which has changed ideas about work. One of the first changes was that other forms of energy havetaken the place of human power. Along with this came the increased use of machines to manufac-ture products in less time.People also developed machines that could produce the same parts for a product: each nail wasexactly like every other nail, meaning that each nail could be changed for every other nail. Thismeans that goods could be mass produced, though mass production required breaking productiondown into smaller and smaller tasks.Once this was done, workers no longer started on the product and labored to complete it. In-stead, they might work only one thousandth of it, other workers completing their own parts in cer-tain order. There is nothing strange about this manufacturing work by today’s standards. Highlyskilled workers were unable to compare with the new production techniques, as mass production al-lowed goods of high standard to be produced in greater number than could ever be done by hand.But the skilled worker wasn’t the only loser, the common workers lost too. Similar changes forcedfarmers away. The increased mechanization(机械化) of agriculture freed masses of workers fromploughing the land and harvesting its crops. They had little choice but to stream toward the rapidlydeveloping industrial centers. Increasingly, standards were set by machines. Workers no longerowned their own tools, their skill was no longer valued, and pride in their work was no longer pos-sible. Workers fed, looked after and repaired the machines that could work faster than humans atgreatly reduced cost. The underlined word "this" in the first paragraph refers to ______
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