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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
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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： 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 ______
[背景资料]某公路工程H合同段，其中土方路基绝大部分是借土填方，路堤边坡高度≥20m，地面横坡＞12%，施工单位施工组织设计中路基填筑的施工方案如下：事件一：土质分析。在K19+100～K20+100处，本路段主要是粉质土，颗粒组成以小于0.075mm为主，属于细粒土组，是较好的路基填筑材料。事件二：压实机具的选择与操作。本路段选用CA25D和YZT16型振动压路机组合碾压施工。施工过程中，压路机行走速度控制在2～4km/h。开始时土体松散，采用轻压(静压)，然后用最大振动力进行振压，压力越大压实效果越好。先压中间，然后向两边压实，并注意纵向和横向压实时的重叠，确保压实均匀。事件三：实验路段的结果。在K18+100～K18+200处，分别取3种松铺厚度20cm、30cm、40cm进行试验，试验路段测试结果最佳含水量为13.4%，其他指标均符合路基填筑要求，松铺厚度选用30cm；施工中施工单位准确放样，认真压实原地基后采用纵向分层填筑法按施工方案进行了路基填筑，填筑过程中每完成一层均检测了压实度、弯沉值、纵断高程、中线偏位、宽度、横坡、边坡几个项目，依此判断合格后再进行下一层填筑，在施工过程中遇雨，雨后检测填料含水量在15%～17%范围内变化，严格按压实质量控制进行施工仍出现“弹簧”现象，为赶工期，施工单位掺入生石灰粉翻拌，待其含水量适宜后重新碾压。最后如期完成路基施工进入路面基层施工工序。问题： K19+100～K20+100路段的土质分析是否正确该土质能否直接作为路床填筑材料
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