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【单选题】Earthquakes An earthquake is one of the most terrifying phenomena that nature can dish up. We generally think of the ground we stand on as "rock-solid" and completely stable. An earthquake can shatter...
A.
More than 3 million.
B.
1.5 million.
C.
About 8,000.
D.
11.
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【多选题】铜矿床的氧化带常产出
A.
辉铜矿
B.
孔雀石
C.
斑铜矿
D.
蓝铜矿
【单选题】Earthquakes An earthquake is one of the most terrifying phenomena that nature can dish up. We generally think of the ground we stand on as "rock-solid" and completely stable. An earthquake can shatter...
A.
More than 3 million.
B.
1.5 million.
C.
About 8,000.
D.
11.
【单选题】下面哪一个不是岩浆的形成条件？
A.
压力
B.
水分
C.
压强
D.
温度
【单选题】岩浆的成分主要是下面哪一项：（）
A.
磷酸盐熔浆
B.
盐酸熔浆
C.
硅酸盐熔浆
D.
硫酸盐熔浆
【单选题】一般认为，岩浆形成的源地是：
A.
地壳的底部
B.
地幔的下部
C.
地核
D.
软流层
【单选题】按矿床成因分类，则岩浆矿床属于（）。
A.
岩浆分结矿床
B.
伟晶岩床
C.
内生矿床
D.
外生矿床
【判断题】斑状和似斑状结构都表明岩浆结晶具有阶段性。()
A.
正确
B.
错误