单项选择题
A.75 B.80 C.85 D.90
A.1 m B.0.5 m C.1.5m D.0.3 m
A.50% B.65% C.75% D.90%
A.4 CM(含4 CM) B.5 CM(含5 CM) C.8 CM(含8 CM) D.10 CM(含10 CM)
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