A.C%<0.7% B.C%<0.9% C.C%<1.4% D.C%<0.8%
A.C%=0.7% B.C%=0.9% C.C%=0.4% D.C%=1.3%
A.熱脆 B.冷脆 C.白點(diǎn) D.時(shí)效