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Select valid identifier of Java: （）
- A、userName
- B、%passwd
- C、3d_game
- D、$charge
- E、this
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单选题Select valid reasons for IT performance issues that cannot be universally solved by adding more hardware：（）A
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单选题Which of the following is not a valid setting for the PROGRAM_TYPE parameter in a program object or the JOB_TYPE parameter in a job object？（）A
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单选题What does a BGP route reflector do when reflecting a route?（）A
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It prepends its own originator identifier to the route's cluster list.C
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