多项选择题
A.MUX B.SSW C.PEM D.GP
A.135.26.186.18 B.135.25.186.10 C.135.25.186.9 D.135.26.186.17
A.MSC B.MGW C.BSC D.SGSN
A.28 B.30 C.31 D.29
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