当测量小扭力时，用细弹簧替换粗弹簧。
When measuring the lower torque, replace to with a liny spring.
选择适合的压力、扭力传感器，开发单片机控制电路、小信号放大器，应用PC机并配合多功能数据采集卡完成数据采集与处理。
Select the appropriate pressure and torque sensors, develop SCM control circuit and small-signal amplifier, do data acquisition and Processing by PC and multifunctional data acquisition card.
对功率小或转速高的电钻通过设置减速器来增大扭力或降低转速，以提高疏通效果。
The electric drill with small power or a high rotating speed increases torsion or reduces the rotating speed by being provided with a speed reducer in order to increase dredging effects.
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