在金属器和管道内使用行灯，其电压不应超过（）伏。
A. 36V
B. 24V
C. 12V
D. 6V
Which two statements are correct about database transportation?（） (Choose two.)
A. The source and target platforms must be the same
B. Redo logs, control files and temp files are also transported
C. The transported database must have the same database identifier (DBID) as the source database and cannot be changed
D. The COMPATIBLE parameter must be set to 10.0.0.0 or higher and the database must be opened in readonly mode before being transported
E. Recovery Manager (RMAN) is used to convert the necessary data files of the database if the target platform is different and has different endian format
环境温度高低变化，可使继电器和接触器的线圈阻值发生变化。
A. 正确
B. 错误
在PowerPoint 2000中，设置文本的段落格式时，要从菜单栏的（）。
A. 视图菜单处设置
B. 插入菜单处设置
C. 格式菜单处设置
D. 工具菜单处设置
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