The ideal shifting process is labor-saving and quick, that is, the smaller of the product of the shift time and the shift force, the better. So, it's reasonable to evaluate with shift Impulse.
理想的同步过程为既省力而又迅速的，即换档力和换档时间的乘积越小越好，因此利用换档冲量来评价同步器是合理的。
Therefore, the needle-nail objects can be drawn out without too large force, plays a time-saving and labor-saving effect, and improves the security of the operation.
因此，不需要太大力即可以将针钉物拔出，起到了省时、省力的效果，并且提高了操作的安全性。
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