A.冷脆,熱脆 B.冷脆,冷脆 C.熱脆,冷脆 D.熱脆,熱脆
A.[C]>2% B.[C]>4.3% C.[C]<2% D.[C]<4.3%
A.1.7% B.0.77% C.0.077% D.0.21%