药物的作用是指（） ["药理效应","药物具有的特异性作用","对不同脏器的选择性作用","药物对机体细胞间的初始反应","对机体器官兴奋或抑制作用"]
You are managing an Oracle Database 11g database. You want to take a backup on tape drives of the USERS tablespace that has a single data file of 900 MB. You have tape drives of 300 MB each. To accomplish the backup， you issued the following RMAN command： RMAN>BACKUP SECTION SIZE 300M TABLESPACE users； What configuration should be effected to accomplish faster and optimized backups by using the above command？（） [" The SBT channel must be configured， with the default parallelism setting for the SBT device set to 1"," The COMPATIBLE initialization parameter for the database instance must be set to at least 10.0"," The SBT channel must be configured， with the parallelism setting for the SBT device set to 3"," The SBT channel must be configured， with the MAXPIECESIZE set to 300 MB"]
与数学表达式对应的Object Pascal表达式是（）
某写字楼工程，地下1层，地上10层。当主体结构已基本完成时，施工企业根据工程实际情况，调整了装修施工组织设计文件，编制了装饰工程施工进度网络计划，如图2-1所示，经总监理工程师审核批准后组织实施。
在工程施工过程中，发生了以下事件：
事件1：工作E原计划6日，由于设计变更改变了主要材料规格与材质，经总监理工程师批准，E工作计划改为9日完成，其他工作与时间执行网络计划。
事件2：一层大厅轻钢龙骨石膏板吊顶，一盏大型水晶灯（重100kg）安装在吊顶工程的主龙骨上。
事件3：由于建设单位急于搬进写字楼办公，要求提前竣工验收，总监理工程师组织建设单位技术人员、施工单位项目经理及设计单位负责人进行了竣工验收。
竣工验收是否妥当？说明理由。
Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object？（） ["When using versions of Java technology earlier than 5.0.","When sharing a StringBuffer among multiple threads.","When using the java.io class StringBufferInputStream.","When you plan to reuse the StringBuffer to build more than one string."]
调压回路和减压回路所采用的主要液压控制元件分别是（）和（）。
