Apex domains cannot have CNAME records.
Question and response
Question
dig suihuoji.com. NS
Answer
suihuoji.com. 5 NS ns-705.awsdns-24.net.
suihuoji.com. 5 NS ns-37.awsdns-04.com.
suihuoji.com. 5 NS ns-120.awsdns-15.com.
suihuoji.com. 5 NS ns-1046.awsdns-02.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0