The passage is mainly concerned with ______.
A.the distinction between fine art and folk art
B.the characteristic of fine art
C.the characteristic of folk art
D.the advantages of fine art over folk art
第7题
A.(A)入射X射线(入射光子)激发原子产生电子和辐射的过程;
B.(B)入射X射线(入射光子)激发分子产生电子和辐射的过程;
C.(C)入射X射线(入射光子)激发离子产生电子和辐射的过程;
D.(D)入射X射线(入射光子)激发原子产生特征辐射的过程;
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