Which of the following are the basic principles of storage troubleshooting? (multiple choice)

Which of the following are the basic principles of storage troubleshooting? (multiple choice)
A . Locate the exterior first, then the interior
B . First perform an alarm analysis, then use the replacement method
C . First find the high-level alarm, then the low-level alarm
D . Find the common first alarm, after the individual alarm

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Answer: A,C,D