A rotating commutator on the dc machine, used as an exciter, was a common means for achieving rectification in the past.
在过去，直流励磁机上的旋转整流子是用作整流的普遍措施。
Machine rectification: machine rectification is using machine power to rectify deformation, which can be taken by hand hammering or machine pressure.
机械矫正法：机械矫正法是利用机械力的作用来矫正变形，可以用手工锤击或机械压力。
Such as operation program, selection of earth pressure, wall-back grouting, rectification of shield machine, which are used to reduce the effect of construction on environment, are analyzed in detail.
详细分析了掘进模式、土压力选择、壁后注浆、盾构纠偏等施工控制手段，用来减小盾构施工对周边环境的影响。
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