Apex domains cannot have CNAME records.
Question and response
Question
dig semiramistrans.ro. NS
Answer
semiramistrans.ro. 5 NS selena.ns.oneserver.ro.
semiramistrans.ro. 5 NS talos.ns.oneserver.ro.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0