单项选择题
A.5% B.10% C.15% D.20%
A.泥岩 B.砂岩 C.灰岩 D.白云岩
A.5 B.10 C.15 D.20
A.1.32~1.36 B.1.07~1.11 C.1.55~1.59 D.1.36~1.40
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