Refer to the exhibit. Which two of these are correct regarding the recommended practice for distribution layer design？（） ["use a redundant link to the core","use a Layer 2 link between distribution switches","never use a redundant link to the core because of convergence issues","use a Layer 3 link between distribution switches with route summarization","use a Layer 3 link between distribution switches without route summarizatio"]
领先创新战略中的新技术，应具有（）。 ["导致成本或差别优势","通过专利、专有技术、商标专用权等手段繁殖被其他组织模仿","具有持久的竞争优势","改进整个产业结构E.增强企业的整体创新意识"]
危机介入模式的满足条件？
工资及福利费成本项目是指（）。 ["全体职工的工资和按规定比例计提的福利费","直接参加产品生产的工人工资及福利费","计入成本的原材料节约奖","车间管理人员工资及福利费"]
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