【单选题】【消耗次数：1】
Half of the workers here ___ under 30 ___.
①
is/years
②
are/year old
③
is/years old
④
are/years of age
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《建设工程质量管理条例》（国务院令第687号），设单位应当自建设工程竣工验收合格之日起一个月内，将建设工程竣工验收报告和规划、公安消防、环保等部门出具的认可文件或者准许使用文件报建设行政主管部门或者其他有关部门备案。
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错
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优化资源要素配置，提升资源要素的使用效率
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催生新产品、新模式、新业态，为发展增添新活力
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维护公平竞争的市场秩序，营造竞争有序的市场环境