A.由核部向兩翼巖層逐漸變新 B.由核部向兩翼巖層逐漸變老 C.由核部向兩翼巖層無變化 D.由核部向兩翼巖層即可變新也可變老
A.3.5 B.2.7 C.3.0 D.2.8
A.0.5% B.0.05% C.0.1% D.0.3%