A.彎拉強(qiáng)度大,彎沉變形大B.彎拉強(qiáng)度大,彎沉變形小C.彎拉強(qiáng)度小,彎沉變形大D.彎拉強(qiáng)度小,彎沉變形小
A.1/2 B.2/3 C.3/4 D.3/5
A.100mm B.150mm C.200mm D.300mm