特殊用法air counterbalance1.压缩空气平衡重体interlocking frame counterbalance1.联锁机平衡锤， 联构机重锤pointer counterbalance1.指针平衡器points counterbalance1.转辙器平衡铁semaphore counterbalance1.臂板平衡锤， 臂板重锤signal counterbalance1.信号臂板平衡锤weight counterbalance1.配重， 平衡重