题目内容

13. 蓝晶石在同一晶面上，随方向不同，软硬程度不同是晶体的……………………（）

A. 异向性
B. 对称性
C. 均一性
D. 自限性

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The distance from the Earth to the spacecraft is often determined very accurately from the time _____ between two radio signals.

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文学创意写作的本质特征是（）

A. 感性特征；情感特征；间接特征；
B. 感性特征；理性特征；间接特征；
C. 个性特征；情感特征；间接特征；
D. 共性特征；情感特征；间接特征。