Apex domains cannot have CNAME records.
Question and response
Question
dig chenyang-crgfts.com. NS
Answer
chenyang-crgfts.com. 5 NS ns-441.awsdns-55.com.
chenyang-crgfts.com. 5 NS ns-1802.awsdns-33.co.uk.
chenyang-crgfts.com. 5 NS ns-1205.awsdns-22.org.
chenyang-crgfts.com. 5 NS ns-709.awsdns-24.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0