Influence of factors on fundamental frequency such as tapering coefficient, counterweight on tower top and elastic support were discussed.

分析了附加质量、变截面系数和弹性约束等因素对结构基频的影响。

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The wire ropes which support the car are fixed to a heavy counterweight which moves up and down the lift shaft on separate guide rails.

支撑电梯厢的钢丝绳另一端固定在一个平衡配重上。 平衡配重在升降井里沿着单独的导轨上下移动。

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One such service is the Counterweight Programme where experienced dieticians give nurses and GPs training and support over six months.

BBC: NEWS | Health | ?3m boost to aid fight on obesity

There is strong and growing support across Europe for the European Union becoming a powerful counterweight to America.

ECONOMIST: Yet more reason to worry about those Europeans

The fourth is that Mr Bush has the support of the Republican governors, who can act as a powerful counterweight to the education establishment.

ECONOMIST: The education president (Part 2)