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串是由零个或多个______组成的。
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层次数据库模型的结构是一棵______，树的结点是记录类型。
2009年5月，某零售企业的部分陶瓷供应商陆续收到来自其零售企业的审核函。函中表示零售企业将派出专员到陶瓷厂家进行现场审核，审核目的主要是评估工厂是否符合相应的要求。据悉，审核结果很有可能将决定该陶瓷厂家是否能与零售企业续约。 审核结束后，应对供应商的( )以及相关使用经验、服务和技术支持能力情况进行综合评估后，才能确定是否选择。
供应商评估工作在企业实施稳定的供应链合作关系、保证产品质量、降低生产成本、提高经济效益等方面发挥着巨大的作用。某电器公司2003年介入电器行业。最初供应商评估工作是由供应方自己进行的。2008年公司具备了生产条件之后才开始自行开展供应商评估工作。目前，该公司已经建立起了一整套供应商评估体系，其评估原则也已逐渐成为企业文化的一部分。现该公司产品的某关键部件需由供应商提供。 假如最后选定甲供应商和乙供应商作为该部件的供应商，该电器公司在合作过程中通过进货全数检验发现乙供应商提供产品的不合格率长期远远低于企业允许的不合格率，该电器公司可以考虑采取( )措施减低成本。
From Boston to Los Angeles, from New York City to Chicago to Dallas, museums are either planning, building, or finishing wholesale expansion programs. These programs already have dramatically altered appearances and floor plans or are expected to do so in the not-too-distant future. In New York City alone, six major institutions have spread up and out into the air space and neighborhoods around them or are preparing to do so. The reasons for this activity are complex, but one factor is a consideration everywhere—space. With collections expanding, with the needs and functions of museums changing, empty space has become a very precious commodity. Probably nowhere in the country is this more tree than at the Philadelphia Museum of Art, which has needed additional space for decades and which received its last significant facelift ten years ago. Because of the space crunch, the Art Museum has become increasingly cautious in considering acquisitions and donations of art, in some cases passing up opportunities to strengthen its collections. Selling off works of art has taken on new importance because of the museum’s space problems. And increasingly, museum presidents have been forced to rotate one masterpiece into public view while another is sent to storage. Despite the clear need for additional gallery and storage space, however "the museum has no plan, no plan to break out of its envelope in the next fifteen years," according to Philadelphia Museum of Art’s president. "The space crunch" most probably means ______.
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