The total kinetic resistance of a moving part (a firearm bolt) was acquired by experiment because water resistance was difficult to be got accurately.
因水阻力较难准确求得，可利用实验确定活动件(枪机)运动总阻力。
The total kinetic resistance of a moving part (a firearm bolt) was acquired by experiment because water resistance was difficult to be got accurately.
因水阻力较难准确求得，可利用实验确定活动件(枪机)运动总阻力。
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