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Share some HCNP H31-321-ENU exam questions and answers below.
During the maintenance of the device, which of the following precautions are needed when replacing a board? (Multiple choice) 
A. Wear an ESD-preventive wrist strap or ESD-preventive gloves 
B. Record the setting of jumper and DIP switch on the board 
C. Query the related alarms and performance events through the NMS 
D. Avoid laser damage to eyes 
E. Correctly unplug the board. If the pull tab of the board has a fiber cable, should remove it first, and then insert it again after replacing the board. 
Answer: ABDE

Which of the following is a negative adjustment for the AU pointer adjustment? 
A. 3 bytes after H3 
B. Three H3 bytes of the AU-PTR 
C. 3 bytes before the H3 
D. The three bytes before J1 
Answer: B

2M Error code testor can be used for electrical interface error code test, which of the following boards can be connected to 2M Error code testor to complete this test? (Multiple choice) 
A. D75S 
B. D12S 
C. SEP 
D. D34S 
Answer: AB

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