单项选择题
A.横纹抗剪B.顺纹血剪C.横纹受压D.顺纹受压
A.1.7321B.0.866C.1.1547D.1.4142
A.1.1547B.0.866C.1.7321D.1.082
A.540B.600C.700D.720
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