A.壓縮形變 B.壓縮應(yīng)力 C.切向形變 D.切向應(yīng)力
A.3d B.7d C.14d D.28d
A.4位有效數(shù)值 B.5位有效數(shù)值 C.0.1kg/m3 D.0.5kg/m3