单项选择题
A.0.1 B.0.2 C.0.4 D.0.6
A.3 B.2 C.5 D.8
A.中丝读数0.8m B.上丝读数0.8m C.下丝读数0.8m D.上丝读数0.7m
A.3.5 B.2.5 C.1.5 D.0.7
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