We drop a piece of metal into a jar full of water, the metal will float if it weighs less than______.
A. an equal amount of silver
B. an equal amount of gold
C. all the water in the jar now
D. the water that leaves the jar
正确答案：D
50．答案为D此题为推断题根据阿基米德定理推断试验的结果答案选D
