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The rigid higher-education business is about to experience a welcome earthquake. Traditional universities now face a new【C1】______in the form of massive open online courses, or MOOCs. These digitally-delivered courses, which teach students via the【C2】______or tablet apps, have big【C3】______over their established rivals. With low startup costs and powerful economies of scale, online courses【C4】______lower the price of learning and【C5】______access to it, by【C6】______the need for students to be taught at set times or places. The low cost of【C7】______courses—creating a new one costs about $70,000— means they can be sold【C8】______, or even given away. Clayton Christensen of Harvard Business School considers MOOCs a【C9】______"disruptive technology" that will kill off many【C10】______universities. "Fifteen years from now more than half of the universities in America will be in bankruptcy," he【C11】______last year. 【C12】______, traditional universities have a few favorable aspects. As well as teaching, examining and certification, college education creates social capital. Students learn how to【C13】______present themselves, make contacts and roll joints. How can a digital college experience give all of that The answer may be to【C14】______the two. Anant Agarwal, who runs edX-, one of established MOOCs, proposes an alternative to the【C15】______American four-year degree course. Students could spend an introductory year learning via a MOOC,【C16】______by two years attending university and a final year starting part-time work while【C17】______their studies online. This sort of【C18】______learning might prove more attractive than a four-year online degree. It could also【C19】______those who want to integrate learning with work or child-rearing, freeing them from timetables assembled to【C20】______academics. 【C7】
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People"s financial history has a strong impact on their taste for risk. Looking at surveys of American household【C1】______from 1960 to 2007, Ul-rike Malmendier of the University of California at Berkeley and his cooperator found that people who【C2】______high returns on the stock market【C3】______in life were, years later, likelier to report a higher tolerance for risk, to own shares and to invest a bigger slice of their【C4】______in shares. But【C5】______to economic turmoil appears to suppress people"s appetite for risk【C6】______of their personal financial losses. That is the【C7】______of a paper by Samuli Knupfer of London Business School and two co-authors. In the early 1990s a severe recession caused Finland"s GDP to【C8】______by 10% and unemployment to【C9】______from 3% to 16%. Using detailed data on tax, unemployment and military conscription(draft), the authors were able to【C10】______the investment choices of those【C11】______by Finland"s "Great Depression". Controlling for age, education, gender and【C12】______status, they found that those in occupations, industries and regions hit harder by unemployment were【C13】______likely to own stocks a decade later. Individuals" personal misfortunes, however, could explain at most half of the【C14】______in stock ownership, the authors reckon. They【C15】______the remainder to "changes in beliefs and preferences" that are not easily measured. This seems【C16】______with a growing body of research that links a low tolerance of risk to 【C17】______emotional trauma(a severe shock). Studies have found, for example, that natural【C18】______such as the tsunami(a large destructive wave)that hit South-East Asia in 2004 and military【C19】______such as the Korean war can render their victims more【C20】______for years. 【C6】
关于施工总平面图设计要点，下列说法中，正确的是______。
某高校新建宿舍楼工程，地下一层，地上五层，钢筋混凝土框架结构。采用悬臂式钻孔灌注桩排桩作为基坑支护结构，施工总承包单位按规定在土方开挖过程中实施桩顶位移监测，并设定了监测预警值。 施工过程中，发生了如下事件。 事件1：项目经理安排安全员制作了安全警示标志牌，并设置于存在风险的重要位置，监理工程师在巡查施工现场时，发现仅设置了警告类标志，要求补充齐全其他类型警示标志牌。 事件2：土方开挖时，在支护桩顶设置了900mm高的基坑临边安全防护栏杆；在紧靠栏杆的地面上堆放了砌块、钢筋等建筑材料。挖土过程中，发现支护桩顶向坑内发生的位移超过预警值，现场立即停止挖土作业，并在坑壁增设锚杆以控制桩顶位移。 事件3：在主体结构施工前，与主体结构施工密切相关的某国家标准发生了重大修改并开始实施，现场监理机构要求修改施工组织设计，重新审批后才能组织实施。 事件4：由于学校开学在即，建设单位要求施工总承包单位在完成室内装饰装修工程后立即进行室内环境质量验收，并邀请了具有相应检测资质的机构到现场进行检测，施工总承包单位对此做法提出异议。 [问题] 事件1中，除了警告标志外，施工现场通常还应设置哪些类型的安全警示标志
某办公楼建筑面积4500m2，主体结构为现浇钢筋混凝土框架结构，混凝土为商品混凝土，组合钢木模板，柱混凝土强度等级为C30。在主体结构施工过程中，第三层柱因模板拼缝不严，造成有多处的孔洞、蜂窝和麻面。经现场混凝土强度检测，混凝土强度满足设计要求，但修补造成经济损失1.2万元。 [问题] 防治混凝土蜂窝、麻面的主要措施有哪些
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