“礼”在先秦时期的发展，大致经过了三个阶段，其中第一阶段是作为（）的阶段；第二阶段是指（）的阶段；第三阶段是指（）。
The EMPLOYEES table is stored in the SAMPLE tablespace. The corresponding IPK_EMP index for the EMPLOYEES table’s primary key is stored in the INDX tablespace. Out of 12 partitions， only partition P1 of the SALES table is stored in the SAMPLE tablespace. Which object will be exported by this command？（） exp system/manager tablespaces=SAMPLE ["Only the EMPLOYEES table.","Only the EMPLOYEES table and its corresponding primary key index.","The EMPLOYEES table and partition P1.","The EMPLOYEES table， IPK_EMP index， and the SALES table."]
如图所示，在溢流坝下游收缩断面hc＝0.315m，溢流坝单宽流量q＝2.45m2/s 。已知下游水深ht＝1.5m。
试判别是否需要修建消力池？
下列何药可翻转肾上腺素的升压效应（） ["酚妥拉明","阿替洛尔","利血平","阿托品","以上都不能"]
精神分裂症最多见的幻觉是（） ["听幻觉","视幻觉","触幻觉","嗅幻觉","味幻觉"]
论述原油稳定塔的工作原理及作用？
