短语词组短語torsional pendulum viscometer 扭擺粘度計worm spring torsional pendulum 蝸簧扭擺torsional pendulum analysis 扭擺分析torsional pendulum clock 扭擺鍾trifilar torsional pendulum 三線扭擺系統modified torsional pendulum 扭擺法 返回 torsional pendulum