分析了推力的频谱，发现推力存在着较大的波动。
在温度，压力有较大的波动时，选用弹性好的或自紧式密封垫；
In temperature, pressure have larger fluctuation, choose elastic good or self-tightening type gasket;
特别是当世界财产保险市场发生了比较大的波动时，对中国财产保险市场的影响就更大。
Especially, when there was a large fluctuation in the global non-life insurance market, the impacts on China′s non-life insurance market were more significant.
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