研磨剂中的磨料,微粉用混沉法取得,号数越大,磨料越粗;号数越小,磨料越细。
以下关于食品的低温储存技术的论述,正确的是() 冷却法适用于水分含量较高的生鲜食品。 -2℃~2℃是果蔬的储藏温度。 使用冷冻法储藏食品时,其温度控制在0℃~10℃。 低温储存技术是利用低温降低氧气浓度抑制霉腐微生物的生理活动。
Your database operates in ARCHIVELOG mode. Usermanaged consistent backups are performed every Sunday night. On Tuesday, client A drops a table at 8:00 a.m. as follows: SQL> DROP TABLE cust_ord PURGE; Table dropped. Client B executes a query at 9:00 a.m. on the same table as follows: SQL> SELECT * FROM cust_ord; SELECT * FROM cust_ord * ERROR at line 1: ORA00942: table or view does not exist Client B needs the dropped table and reports the problem to you. With reference to this scenario, which action should you take?() retrieve the table by using the flashback feature。 restore all the data files from last Sunday’s backup, and then perform a timebased recovery。 restore all the data files from last Sunday’s backup, and then perform a log sequence recovery。 restore all the data files from last Sunday’s backup, and then perform a cancelbased recovery。 restore from last Sunday’s backup only data files that belong to the tablespace in which the table was stored, and then perform a complete recovery。
ISP的义务包括() 服务行为合法。 保证信息内容合法。 监控。 协助调查。
A customer wants to install an IBM BladeCenter infrastructure but is concerned about the cost of the full fabric internal fibre switches. Consequently, the customer is considering an N_Port ID Virtualization (NPIV) capable switch. Which of the following should be mentioned to the customer regarding the NPIV switch?() Youcan not use an NPIV switch in the same IBM BladeCenter chassis as a Cisco Intelligent Ethernet Switch。 Using blade servers with the NPIV switch will require morefibre ports on the external fibre switch。 Storage devices likeFibre Channel Tape and Disk cannot be attached to the NPIV Switch but must connect to a core fabric switch.。 The NPIV switch will count against the number of domains in a fabric。
地下燃气管道不得从其下面穿越的场所是()