... [geometric series] 几何级数,形如a+ar+ar 2 +ar 3 +之级数 [equal-arm balance] 一种简单天平,从天平臂的中间支承点到两端称量盘之间的距离相等 [equilateral triangle] 三边都相等的三角形 ...
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equal arm balance [仪] 等臂天平
This type of equal arm balance with double beam and pan adopts flexible steel band as support without abrasion to the edges of the knife.
复梁式双盘等臂天平，采用钢带弹性作支撑，无刀口磨损现象发生。
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?
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？
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