A.140 B.150 C.160 D.170
A.0.5~1 B.1~1.2 C.1~1.5 D.1.5~2
A.抗壓強(qiáng)度高,結(jié)構(gòu)質(zhì)量輕 B.抗拉強(qiáng)度高,結(jié)構(gòu)質(zhì)量輕 C.抗彎強(qiáng)度高,結(jié)構(gòu)質(zhì)量輕 D.抗扭強(qiáng)度高,結(jié)構(gòu)質(zhì)量輕