But servo systems have serious non-linearity when glutinosity of the oil and system load changed and some uncertain ingredients affected of the servo system in practical task.

• 但由于实际工作中电液伺服系统中液压油的粘性的变化、系统负载变化以及一些不确定因素的影响，使得电液伺服系统具有很严重的非线性。