题:由铜、铝、铁制成的三个实心金属球,被细线拴好,分别挂在三只弹簧秤下,将三个金属球都浸没于水中,此时三只弹簧种的示数相同,现将三个金属球提出水面,则: (A)拉着铜球的弹簧秤的示数最大。 (B)拉着铁球的弹簧秤的示数最大。 (C)拉着铝球的弹簧秤的示数最大。 (D)三者一样大。 [分析]:这个题目,不是一眼就能看出答案。平常这类习题或者已知它们的质量,或者已知体积,只要动笔一算,将结果比较 Question: The three solid metal balls made of copper, aluminum, and iron are twisted in thin lines and hung under three spring balances. The three metal balls are immersed in water. In the same way, if three metal balls are put on the water surface, then: (A) The spring scale with the copper ball is the largest. (B) The spring scale holding the iron ball shows the largest number. (C) The spring scale with the aluminum ball is the largest. (D) The three are as big. [Analysis]: This topic is not one you can see the answer. Ordinary types of exercise or known quality, or known volume, as long as the first calculation, the results will be compared