托盘天平，一种实验室常用的称量用具由托盘、横梁、平衡螺母、刻度尺、分度盘、指针、刀口、底座、标尺、游码、砝码、铭牌等组成。精确度一般为0.1g或0.2g，荷载有100g、200g、500g、1000g等。
翻译：你有3个砝码：1公斤、3公斤和9公斤，以及一个托盘天平，你可以称出多少个不同的重量？
You have 3 weights:1 kg, 3 kg and 9 kg as well as an equal arm balance, as shown. How many different weight objects can you weigh with these three?
若将托盘的天平拆除，它看起来就像一个大熊猫，使称量更好玩！
The scale with tray removed looks just like a Panda Bear, making weighing more fun!
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