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经委托方同意，分承接方可以将所承接的业务再次委托。( )
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某电器设备厂筹资新建一生产流水线，该工程设计已完成，施工图纸齐备，施工现场已完成“三通一平”工作，已具备开工条件。工程施工招标委托招标代理机构采用公开招标方式代理招标。 招标代理机构编制了标底(800万元)和招标文件。招标文件中要求工程总工期为365天。按国家工期定额规定，该工程的工期应为460天。 通过资格预审并参加投标的共有A、B、C、D、E 5家施工单位。开标会议由招标代理机构主持，开标结果是这5家投标单位的报价均高出标底近300万元，这一异常引起了业主的注意，为了避免招标失败，业主提出由招标代理机构重新复核和制定新的标底。招标代理机构复核标底后，确认是由于工作失误，漏算部分工程项目，使标底偏低。在修正错误后，招标代理机构重新确定了新的标底。A、B、C 3家投标单位认为新的标底不合理，向招标人要求撤回投标文件。 由于上述问题纠纷导致定标工作在原定的投标有效期内一直没有完成。 为早日开工，该业主更改了原定工期和工程结算方式等条件，指定了其中一家施工单位中标。 A、B、C 3家投标单位要求撤回投标文件的做法是否正确为什么
调查对象是指根据调查目的确定的现象个体。( )
[背景资料] 某城市道路工程，基层采用水泥稳定土，施工中的部分技术指标如下所述。 (1)选用初凝时间3h以下的32.5级水泥。 (2)水泥稳定土中的中粒土做基层时，水泥剂量不宜超过10%。 (3)施工最低气温为-5℃。 (4)基层保湿养护不宜小于3h。 (5)基层的压实厚度最多不超过30cm。 在该道路工程面层施工时，已进入冬期，施工项目经理部为此提出了应对措施。 [问题] 水泥稳定土路基层宜在哪个季节施工
The appeal of the world of work is first its freedom. The child is compelled to go to school: he is (21) of authority. As he grows up, he sees what it is to be free of school and to be able to choose his job and change it if he doesn’t like it. The boys and girls, (22) he has long observed, revisit school utterly changed and apparently mature. Suddenly teachers seem as out of date as his parents and the authority of school a ridiculous thing. At the moment the adult world may appear (23) the school world that the desire to enter it cannot be satisfied by exercises in school books. This may not be the (24) but it is a necessary part of growing up, for every man and woman must come sooner or later to the point of saying "Really, I’ve had enough of being taught; I must (25) ". Some young people come to this decision sooner than they ought. Yet in a way this is not a bad frame of mind to be in (26) leaving school. At work, the young man makes one of the first great acceptances of life——he accepts the discipline of the material or the process he is working with. He sees the point of it and in doing so (27) life. The work process constitutes a reality in some sense superior to that of school, and this is why he so often longs to get to grips with it. Nothing done in school imposes its will in (28) the same way; if the maths master is ill one can get on with something else. But even the boy delivering papers, (29) the driver taking out his bus, discovers that one cannot put it off because there is snow on the ground, or the foreman (工头) is easily annoyed, or he himself (30) that morning. 23（）
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