The stewards all wore armbands.乘务员都戴了臂章。Organisers had consulted widely with police, stewards and safety officers to ensure tight security.组织者广泛征询了警方、管事和保安的意见，以保证绝对安全。The stewards' badges are made so they do not uns...
生理学的产生和发展; 前馈控制特点及生理意义.Physiological production and development; The characters and physiological meaning of Feed - forward control.前馈校正的引入克服了电压均值反馈控制快速性不好的缺点.The introduction of feedforward enhance speediness of this co...