Apex domains cannot have CNAME records.
Question and response
Question
dig ecritel.cn. NS
Answer
ecritel.cn. 5 NS dns25.hichina.com.
ecritel.cn. 5 NS dns26.hichina.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0