多项选择题红外分光光度计的光源是 A. 硅碳棒 B. 能斯特灯 C. 氙灯 D. 汞灯 E. 氘灯
单项选择题( )is the act of granting authority to employees to make key decision within the employee’s areas of responsibility.A.TrainingB.empowermentC.Delegation
