Which two events will cause a slave server to create a new relay log file?（）
A. Execution of the FLUSH LOGS statement
B. Starting of the SQL thread
C. Reaching the slave_pendign _jobs_size_max limit
D. Execution of FULSH TABLES WITH READ LOCK
E. Starting of the I/O thread
Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）
A. Baffle plates that have been bent during prior removal
B. Leaks in the cooler tube nest
C. Operating the engine while maintaining a high sea water outlet temperature
D. A punctured sea water strainer supplying cooling water to the heat exchanger
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