单项选择题
A.冷脆，热脆 B.冷脆，冷脆 C.热脆，冷脆 D.热脆，热脆
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%
A.668mm B.768mm C.868mm
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