单项选择题
A.3.5 B.2.7 C.3.0 D.2.8
A.0.5% B.0.05% C.0.1% D.0.3%
A.1% B.2% C.0.5% D.1.5%
A.流纹岩 B.橄榄岩 C.安山岩
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