单项选择题
A.20m B.21m C.22m
A.0.11,0.20 B.0.12,0.25 C.0.13,0.30
A.0.25,0.145 B.0.26,0.150 C.0.27,0.165
A.0.9m;1.10m B.1m;1.20m C.1.1m;1.30m
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