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【问题2】 在VLAN中，STP和VTP是什么协议各有什么作用
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第二篇 Employment Opinion polls are now beginning to show an unwilling general agreement that, whoever is to blame and whatever happens from now on, high unemployment is probably here to stay. This means we shall have to find ways of sharing the available employment more widely. But we need to go further. We must ask some fundamental questions about the future of work. Should we continue to treat employment as the norm Should we not create conditions in which many of us can work for ourselves, rather than for an employer Should we not aim to revive the household and the neighbourhood, as well as the factory and the office, as centres of production and work The industrial age has been the only period of human history in which most people’s work has taken the form of jobs. The industrial age may now be coming to an end, and some of the changes in work patterns which it brought about may have to be reversed. This seems a discouraging thought. But, in fact, it could offer the prospect of a better future for work. Universal employment, as its history shows, has not meant economic freedom. Employment became widespread when the enclosures of the 17th and 18th centuries made many people dependent on paid work by depriving them of the use of the land, and thus of the means to provide a living for themselves. Then the factory system destroyed the cottage industries and removed work from people’s homes. Later, as transport improved, first by rail and then by road, people travelled longer distances to their places of employment until eventually, many people’s work lost all connection with their home lives and places in which they in which they lived. Meanwhile, employment put women at a disadvantage. It became customary for the husband to go out paid employment, leaving the unpaid work of the home and family to his wife. All this may now have to change. The time has certainly come to switch some effort and resources away from the impractical goal of creating jobs for all, to the urgent practical task of helping many people to manage without full-time jobs. As a result of the enclosures of the 17th and 18th centuries, ______.
下面是中国人民银行资产负债表 资 产 负 债 Aa对金融机构贷款 La金融机构存款 Ab购买政府债券 Lb财政存款 Ac金银外汇占款 Lc自有资金与当年结余 Mo流通中货币 合计： 合计： 整理可得：M0＝(Aa-La)+(Ab-Lb)+(Ac-Lc) 从上表可知，影响基础货币供应的因素有( )。
A surprising link between changes in the season and crime patterns implies that ______.
2000年10月1日，村民甲、乙两人从北方汽车市场买了一辆二手卡车，准备一块儿跑长途货运业务。两人各出资人民币3万元。同年12月，甲驾驶这辆汽车外出联系业务时，遇到丙，丙表示愿意出资人民币8万元购买此车，甲随即将卡车卖给了丙，并办理了过户手续，事后，甲把卖车一事告知乙，乙要求分得一半款项。丙买到此车后年底又将这辆卡车以人民币9万元转手卖给丁。两人约定，买卖合同签订时，卡车即归丁所有，再由丁将车租给丙使用，租期为1年，租金1.5万元。两人签订协议后，到有关部门办理了登记过户手续。丁把车租赁给丙使用期间，由于运输缺乏货源，于是丙准备自己备货，遂向银行贷款人民币5万元，丙把那辆卡车作为抵押物向银行设定抵押，双方签订了抵押协议，但没有进行抵押登记。 2001年11月丁把该车以人民币10万元的价格卖给了戊。12月丁以租期届满为由，要求丙归还卡车，丙得知丁把车卖给戊，遂不愿归还卡车，主张以人民币9万元买回此车，丁不同意便发生了纠纷。 请问： 丙、丁约定买卖合同签订时，卡车即归丁所有，该约定是否有效为什么
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