Apex domains cannot have CNAME records.
Question and response
Question
dig las.sci.uz. NS
Answer
las.sci.uz. 5 NS hosting.scinet.uz.
las.sci.uz. 5 NS ns01.uzsci.net.
Authority
The response has no authority records.
Additional
ns01.uzsci.net. 1 A 83.69.129.4
hosting.scinet.uz. 1 A 83.69.129.17
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0