A.增大 B.減小 C.不變 D.以上都不對(duì)
A.0.195~0.350MPa B.0.205~0.382MPa C.0.196~0.392MPa D.0.193~0.3420MPa
A.0.150MPa B.0.147MPa C.0.145MPa D.0.149MPa