Jolly spring balance
... 约利秤 Jolly balance 约利弹簧秤 Jolly spring balance 约尼氏病 Johne's disease ...
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利用交流电桥和约利弹簧秤组成实验装置，测量了金属的线胀系数和液体的密度。
Coefficient of linear expansion of metal and density of liquid are measured by the experiment device which is composed of AC bridge and Joly spring balance.
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