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中华人民共和国民政部2012年6月21日发布公告：国务院于近日批准，撤销海南省西沙群岛、南沙群岛、中沙群岛办事处，设立地级三沙市，管辖西沙群岛、中沙群岛、南沙群岛的岛礁及其海域。三沙市人民政府驻西沙永兴岛。 专家认为，以前中国只在永兴岛上设立派出机构，行政级别相当于街道办事处，而这次直接以地级市的行政级别来行使管辖权，这是根本性的变化，表明了中国政府维护南海诸岛主权和国家利益的决心。 运用《政治生活》知识，谈谈中国政府如何维护国家主权和国家利益？
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举一反三
【单选题】You are too stressed out. Why not _____ some light music? [ ]
A.
listen to
B.
listening to
C.
listen
D.
hear
【多选题】What are three factors used to determine the amount of bandwidth that is required for a single VoIP call？（）
A.
codec
B.
link speed
C.
Layer 2 encapsulation
D.
packet overhead （IP/UDP/RTP）
E.
link delay
F.
total number of simultaneous calls that are allowed
【单选题】In a Teleworker deployment with a single IP phone connected to a Cisco 831 router, select the true statement regarding Call Admission Control.（）
A.
RSVP is a required configuration to support conference calls without voice packet loss.
B.
The QoS configuration on the 831 router must always provision sufficient bandwidth for two RTP streams.
C.
Call admission control is an issue only when using hardware DSP resources.
D.
When using the conference call features on a 7960 IP phone, only one RTP stream is present regardless of how many extensions are on the conference.
【单选题】Listen! There must be some children ________ songs in our neighborhood. [ ]
A.
singing
B.
to sing
C.
sing
D.
sings
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