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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？（）
A:mydb is a service name.
B:test.us.oracle.com is a database name.
C:1521 is the listener port number.
D:mydb is a host name.
E:test.us.oracle.com is a net service name.
F:hr is a username.
G:test.us.oracle.com is an instance name.

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出自：Oracle认证

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