A.耐磨、減振性好 B.承壓能力強(qiáng) C.承受切向力強(qiáng) D.生產(chǎn)成本高
A.﹥1 B.1 C.0.82 D.0.65
A.大于0.7MPa B.0.5~0.7MPa C.0.2~0.5MPa D.小于0.2MPa