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【单选题】
根据对某零件的应力分析,材料的强度应满足 R P0.2 >600MPa ,有 4 种材料的强度和塑性指标如下,如果只考虑强度,哪种材料最好? 。A.
R P0.2 =580MPa ， A =30%
B.
R P0.2 =650MPa ， A =20%
C.
R P0.2 =800MPa ， A =20%
D.
R P0.2 =1800MPa ， A =2%
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