Newly installed oracle 10g express edition database

Hai to all
I have fedora 15 operating system with oracle 10g express edition database installed .. I already have working knowledge in mysql database .. my question is that when i opened oracle database via sql developer , then by expanding tables tab on left side .. I can able to see some table that are created by default as the following:
AQ$_INTERNET_AGENT_PRIVS
DEF$_AQCALL
LOGMNR_AGE_SPILLS$
My question is that . Can i drop all these tables ??? . By doing so, will that create any problems ..
Any idea will help me ..
thanks in advance to allllllll

If You wont to see how Oracle drop tables
- create Youre schema
create user test_user ... ;
-create table
create table test_user.test_table ... ;
drop table
table test_user.test_table ;
Regards,
Pavel
Edited by: Pavel on May 22, 2012 10:26 PM

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