Apex domains cannot have CNAME records.
Question and response
Question
dig linzidangxiao.net. NS
Answer
linzidangxiao.net. 5 NS ns-617.awsdns-13.net.
linzidangxiao.net. 5 NS ns-1594.awsdns-07.co.uk.
linzidangxiao.net. 5 NS ns-1432.awsdns-51.org.
linzidangxiao.net. 5 NS ns-1913.awsdns-47.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0