Apex domains cannot have CNAME records.
Question and response
Question
dig nsh.ro. NS
Answer
nsh.ro. 5 NS dns2.nshost.ro.
nsh.ro. 5 NS dns1.nshost.ro.
Authority
The response has no authority records.
Additional
dns1.nshost.ro. 5 A 188.214.105.203
dns2.nshost.ro. 5 A 188.214.105.201
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0