Bit errors are a common phenomenon in equipment maintenance. Which of the following phenomena may cause bit errors? (Multiple choice)

Bit errors are a common phenomenon in equipment maintenance. Which of the following phenomena may cause bit errors? (Multiple choice)
A . The optical power of the optical port exceeds the overload point or is lower than the sensitivity
B . Equipment temperature is higher than normal
C . A lot of pointer adjustments on the device
D . Equipment is not grounded

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Answer: ABCD