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【简答题】

砂的矿物组成有()、长石与石灰石等,以石英砂分布最广。

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参考解析:
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刷刷题刷刷变学霸
举一反三

【单选题】下列全由矿物组成的一组是( )。

A.
石英、玛瑙、煤、云母
B.
辉石、沥青、石油、金刚石
C.
人造水晶、矿泉水、长石、方解石
D.
雪花、高岭石、石英、长石

【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...

A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.