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题目:如图1所示,一把粗细均匀的木尺,置于盛水的杯上,恰好静止.此时木尺露出杯外部分与浸入水中部分
Topic: As shown in Fig. 1, a wooden ruler with a uniform thickness is placed on a cup filled with water. It is exactly at rest. At this time, the wooden ruler exposes the outer portion of the cup and the portion immersed in water.