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题目内容双击单词支持查询和收藏哦～
The common principle behind the hourglass and the water clock is ___________: controlled movement of a fluid or fluid-like substance from one vessel to another can measure a predetermined amount of time.
- A.predictability
- B.balance
- C.versatility
- D.regularity
- E.continuity
- F.adaptability
A,D显示答案
以上解析由 考满分老师提供。
