（多选题）
You connected to the database using the following connection string： CONNECT hr/hr@test.us.oracle.com：1521/mydb Which three statements are correct regarding the connection string？（）
Amydb is a service name.
Btest.us.oracle.com is a database name.
C1521 is the listener port number.
Dmydb is a host name.
Etest.us.oracle.com is a net service name.
Fhr is a username.
Gtest.us.oracle.com is an instance name.
正确答案
答案解析
略
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