Which four actions are possible during an Online Data file Move operation?（）
A. Creating and dropping tables in the data file being moved
B. Performing file shrink of the data file being moved
C. Querying tables in the data file being moved
D. Performing Block Media Recovery for a data block in the data file being moved
E. Flashing back the database
F. Executing DML statements on objects stored in the data file being moved
Ignition failure in an automatically controlled auxiliary boiler could be caused by（）
A. carbon deposits on the flame scanner
B. high fuel oil temperature
C. low fuel oil viscosity
D. high steam pressure
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