Use OTDR to locate the position of abnormal attenuation in the optical path. After the OTDR is connected to the detected line, which of the following parameters can be set? (Multiple choices)

Use OTDR to locate the position of abnormal attenuation in the optical path. After the OTDR is connected to the detected line, which of the following parameters can be set? (Multiple choices)
A . Setting the measurement range
B. Set the wavelength
C. Setup mode
D. Set pulse width

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Answer: ABCD