It also testifies the intermediate variate in the system is servo valve loading pressure ; compensator is a first derivative element.
可以证明本系统的这种观测量是伺服阀的负载压力，而所谓补偿器是一个一阶微分环节，因而容易实现。
Light-emitting element, light-emitting device, electronic device and quinoxaline derivative.
发光元件，发光器件，电子器件和喹喔啉衍生物。
Spirofluorene derivative, material for light-emitting element, light-emitting element, light-emitting device, and electronic device.
螺芴衍生物，发光元件用材料，发光元件，发光设备和电子设备。
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