If you take a spring, it is true that the period of oscillation is independent of the amplitude but only up to a point.
如果用弹簧，周期的确和，振幅无关，但也只是点到为止。
Say so, the period of spring and autumn personality independent trend have appeared is do not doubt.
所以说，春秋时期人格独立化倾向的已经出现是毋庸置疑的。
The invention discloses a casting method of a spine support pillow with an independent built-in spring, which mainly comprises the following steps: A. a mold is opened and cleaned;
本发明公开了一种护脊枕单独内置弹簧浇铸法，主要包含以下步骤：A：打开模具并清洗；
The invention discloses a casting method of a spine support pillow with an independent built-in spring, which mainly comprises the following steps: A. a mold is opened and cleaned;
本发明公开了一种护脊枕单独内置弹簧浇铸法，主要包含以下步骤：A：打开模具并清洗；
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