对于循环流化床锅炉，运行中应控制其含氧量在（）范围内。 ["3～5.5％","6～8％","﹤2％"]
You need to create a partitioned table to store historical data and you issued the following command： CREATE TABLE purchase_interval PARTITION BY RANGE （time_id） INTERVAL （NUMTOYMINTERVAL（1，’month’）） STORE IN （tbs1，tbs2，tbs3） （ PARTITION p1 VALUES LESS THAN（TO_DATE（’1-1-2005’， ’dd-mm-yyyy’））， PARTITION p2 VALUES LESS THAN（TO_DATE（’1-1- 2007’， ’dd-mm-yyyy’））） AS SELECT * FROM purchases WHERE time_id < TO_DATE（’1-1-2007’，’dd-mm-yyyy’）； What is the outcome of the above command？（） [" It returns an error because the range partitions P1 and P2 should be of the same range."," It creates two range partitions （P1， P2）. Within each range partition， it creates monthwise subpartitions."," It creates two range partitions of varying range. For data beyond ’1-1-2007，’ it creates partitions with a width of one month each."," It returns an error because the number of tablespaces （TBS1，TBS2，TBS3）specified does not match the number of range partitions （P1，P2） specified."]
平屋面可采用蓄水试验，蓄水深度宜大于（），蓄水时间不宜少于（）。 ["50mm，24h","30mm，48h","30mm，24h","50mm，48h"]
商品价值由（）为代表形成了不同的学派和理论体系。 ["生产费用价值理论","效用价值理论","经济基础理论","新古典经济学价值理论","劳动价值论"]
You are performing a database recovery because a user’s schema is dropped. While performing the recovery， you use the UNTIL SEQUENCE clause. Which type of database recovery are you performing？（） [" user managed complete recovery"," user managed incomplete recovery"," RMAN-based complete recovery"," RMAN-based incomplete recovery"]
简述关节松动技术的实施步骤。
