简述值类型的主要特点。
Which statement is true regarding RMAN components?() ["Each target database requires its own recover catalog. ","RMAN scripts can be stored in the recovery catalog or the target control file. ","A channel is a stream of data to a device type and corresponds to one server session. ","The RMAN executable interprets sever session commands and establishes connections to the target database."]
根据《中华人民共和国防洪法》、《水库大坝安全管理条例》和《水利水电建设工程验收规程》等规定,在水库蓄水验收前,必须进行蓄水安全鉴定的水库建设工程包括()等。 ["新建工程","续建工程","技术改造工程","加固工程","修复工程"]
简述命名空间的主要特点。
墙身水平防潮层的常见做法有()。 ["防水涂料","防水砂浆","细石混凝土","构件自防水","防水砂浆砌砖"]
清官这一文化现象,所负载的文化内涵最重要的就是()。