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题目内容
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.
- Apredictability
- Bbalance
- Cversatility
- Dregularity
- Econtinuity
- Fadaptability
A,D显示答案
以上解析由 考满分老师提供。