单项选择题
A.0.12m/m B.0.125m/m C.0.13m/m D.0.135m/m
A.0.6 B.0.8 C.0.9 D.1
A.30° B.60° C.75° D.90°
A.1/3 B.2/3 C.1/5 D.3/5
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