单项选择题
A.3 B.2 C.1 D.4
A.1.2-3.5m B.1.3-3.5m C.1.0-3.5m D.1.1-3.5m
A.1:10000 B.1:1000 C.1:2000 D.1:5000
A.15K B.18K C.11K D.13K
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