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【简答题】

常用的型砂由石英砂、()、水和附加物等组成。

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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】培养基不添加任何附加物称为()

A.
完全培养基
B.
基本培养基
C.
不完全培养基
D.
培养基

【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.