单项选择题
A.上屈服强度 B.下屈服强度 C.上屈服强度和下屈服强度 D.上屈服强度和下屈服强度,或下屈服强度
A.0.5 B.0.3 C.1.0 D.1.2
A.625MPa,625MPa B.630MPa,625MPa C.625MPa,615MPa D.630MPa,630MPa