硝化作用
Your business has departmental reports that are generated every day. Each department must use the same set of queries， but accesses a different subset of data in the tables， depending on which department generates the report. The format of the reports is being developed; currently， the format changes daily. How would you configure the database to ensure that each department generates its report （based on its target data） using the most recent report format every day？（） ["by having each user run the report generation procedure at the scheduled time， supplying the necessary input variables","by creating a program using DBMS_JOB that accepts one or more variables， and creating a job that calls this program using DBMS_JOB","by having each user schedule a job using DBMS_JOB that accepts one or more input variables and calls a procedure that generates the report","by having each user create a job using DBMS_SCHEDULER that includes all the information and commands necessary to generate the report","by creating a program using DBMS_SCHEDULER that accepts one or more variables， and creating a job that calls this program using DBMS_SCHEDULER"]
120．1型控制阀紧急活塞杆上紧急室排气限制孔为（）。 ["φt1mm","φ12mm","φ1.6mm","φ1.8mm"]
再生混凝土技术是将废弃混凝土块经过破碎、清洗、分级后，按一定的比例混合形成再生骨料，部分或全部代替天然骨料配制新混凝土的技术。
从时间上的相对性来看，小型企业的概念是随着经济发展及社会变化而不断变动的。
作品的重心位置一般高于作品主干的（）起到花器沿口处。
