A.10m B.20m C.30m D.40m
A.2mm B.3mm C.4mm D.5mm
A.抗壓強(qiáng)度;8.0MPa B.抗壓強(qiáng)度;10MPa C.彎曲強(qiáng)度;8.0MPa D.彎曲強(qiáng)度;10MPa