[多选] Which two are characteristics of RSVP？（）

A . RSVP itself provides bandwidth and delay guarantees.
B . For RSVP to be end-to-end， all devices must support RSVP.
C . RSVP reservations are maintained by a centralized reservations server.
D . An RSVP compatible QoS mechanism must be used to implement guarantees according to RSVP reservations.

Which two benefits does VoFR provide?（） bandwidth efficiency。 cell-switching。 congestion notification。 heterogeneous network。后生作用要帮助学生打破对教师和教材等权威的盲目崇拜。教师的指导要到位而不越位，要让学生学会自我教育。（）学生的主体性集中体现为他们的独立性、主动性和创造性。发挥和培养学生的主体性是实现全面发展教育目标的必由之路。（）对未办理工伤保险的单位的处罚有（）处以应交金额两倍的罚款。补交应徼金额。交滞纳金。承担补交前工伤费用。停产整顿。 Which two are characteristics of RSVP？（）

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[多选] Which two are characteristics of RSVP？ （）

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[多选] Which two are characteristics of RSVP？（）