单项选择题
A.0.5d B.0.85d C.2d D.2.5d
A.L-2c+2×0.268H′ B.L-2c+2×0.414H′ C.L-2c+2×0.577H′ D.L-2c+2×0.115H′
A.1.015 B.1.025 C.1.02 D.1.035
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