选项
A.0.5m: 0.5m
B.1.4m: 0.6m
C.1.8m; 0.35m
D.1.8m; 0.5m
B.1.4m: 0.6m
C.1.8m; 0.35m
D.1.8m; 0.5m
答案
解析
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