单项选择题
A.1000mm B.2000mm C.3D D.5D
A.0.502 B.0.314 C.0.707 D.0.981
A.Ⅲ、Ⅳ B.Ⅲ、Ⅵ C.Ⅰ、Ⅱ D.Ⅲ、Ⅱ
A.10 B.20 C.30 D.40
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