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题目内容 （请给出正确答案）
Youconnectedtothedatabaseusingthefollowingconnectionstring:CONNECThr／hr@test.us.oracle.com:1521／mydbWhichthreestatementsarecorrectregardingtheconnectionstring?()

A.mydbisaservicename.

B.test.us.oracle.comisadatabasename.

C.1521isthelistenerportnumber.

D.mydbisahostname.

E.test.us.oracle.comisanetservicename.

F.hrisausername.

G.test.us.oracle.comisaninstancename.

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