The reason why it closes instantly is that '-pause' is not a valid command line argument.
You are supposed to just write 'pause' in a new line. Try this:
SET ADDRESS=3DovKVnnHhaeQhTJ4UDHy7wwbbFz8yXAvg
SET USERNAME=3DovKVnnHhaeQhTJ4UDHy7wwbbFz8yXAvg
SET POOL=equihash.hk.nicehash.com:3357
SET SCHEME=stratum+tcp
bminer -uri stratum://3DovKVnnHhaeQhTJ4UDHy7wwbbFz8yXAvg@stratum+tcp://equihash.hk.nicehash.com:3357 -api 127.0.0.1:1880
pause