Which three statements describe the functionality of the DO_KEY built-in?（） It accepts both a built-in and a key name as argument. 。 If no key trigger is defined, the specified built-in executes. 。 Its parameter must be specified in upper case, enclosed in single quotation marks. 。 It performs the same task as if you pressed the function key associated with the specified argument. 。 It executes the key trigger that corresponds to the built-in specified as its parameter.&e。
浇筑混凝土前主要检查（）。 钢筋的规格、数量。 钢筋合格证和试验报告。 钢筋位臵、接头是否正确。 检查隐蔽记录。
“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（）。
Which two are advantages of using WLS JMS instead of using a third-party JMS Provider （Tibco， Sonic， etc.） ？ （） JMS subsystem of WLS shares same JVM as core WLS application server， so application avoids the overhead of message serialization/de-serialization （necessary when using a 3rd party JMS provider with WLS）。 WLS JMS ai always faster than 3rd party JMS providers。 Unified operations and management tools across Application Server and JMS Provider will help with mangeability and diagnostics。 WLS JMS more compliant with JMS spec than 3rd party vendor。
材料费是指施工过程中耗费的原材料、辅助材料、构配件、零件、半成品或成品和（）的费用。 工程设备。 机械设备。 材料运输机械。 油燃料。
When performing a backup using Recovery Manager （RMAN）， which four types of files can be backed up with the RMAN BACKUPcommand？ （）
