单项选择题
A.200℃~450℃ B.550℃~650℃ C.450℃~850℃ D.650℃~850℃
A.<5% B.>10% C.>5% D.<10%
A.1Cr18Ni9Ti B.0Cr18Ni9 C.Cr18Ni11Nb D.1Cr17Ni7