单项选择题
A.5 B.10 C.20 D.25
A.9000 B.12000 C.18000 D.23000
A.-65,-80,-50 B.-69,-80,-60 C.-69,-75,-50 D.-65,-75,-60
A.TCP B.RTWP C.ISCP D.SFN观测时间差
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