... ratio adjuster 抽头变换位置，分接开关(变压器的) ratio arm 比例臂，电桥臂 ratio arm box 比例臂[电阻]箱，电桥电阻箱 ...
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它有二个比例臂，一个比较臂，另一桥臂用于接被测量；
It has two proportional limbs, one compare limb, and the other used to link with the measured quantum;
箱形伸缩臂作为汽车起重机的主要受力构件，其重量一般占整机的13 ~ 20%，而大型起重机占的比例则更大。
As the main stress component, box truck crane telescopic boom usually accounts for the weight machine for 13 ~ 20%, while the percentage of large cranes is greater.
该文提出了一种采用内环空间矢量电流调节器和外环同步坐标比例积分控制器相级联的三相四桥臂逆变器的控制方案，实现了对三相四桥臂逆变器的解耦控制。
This paper presents a decoupled control scheme for three?phase four?leg inverter through an inner current regulator based on space vector cascaded with an outer synchronous frame PI controller.
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