A.5 B.10 C.15 D.20
A.免费 B.50元/次 C.100元/次 D.200元/次
A.300 B.400 C.500 D.600
A.15587653444 B.13677890987 C.56301111 D.以上均不是
A.Machine too Machine B.matter too matter C.Machine to Machine D.matter to matter
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