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【单选题】
布拉格方程是产生X射线反射的()。
A.
充分条件；
B.
充要条件；
C.
必要条件；
D.
无关条件。
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【单选题】C Psychology is the study of the mind and mental activities. For example, psychologists are interested in why some things make you sad, but others make you happy. They want to know why s...
A.
the mind
B.
the sports ability
C.
the feelings
D.
the whole brain
相关题目：
【单选题】C Psychology is the study of the mind and mental activities. For example, psychologists are interested in why some things make you sad, but others make you happy. They want to know why s...
A.
the mind
B.
the sports ability
C.
the feelings
D.
the whole brain
参考解析：
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