A.增加集中 B.增加分散 C.減小分散 D.減小集中
A.HRB235>HRB335>HRB400=CRB550 B.CRB550=HRB335>HRB400>HRB235 C.CRB550=HRB400>HRB335>HRB235 D.CRB550≥HRB400>HRB335>HRB235
A.HRB235>HRB335>HRB400>CRB550 B.CRB550>HRB335>HRB400>HRB235 C.CRB550>HRB400>HRB335>HRB235 D.CRB550>HRB335>HRB235>HRB400