求一组数据(5,-3,2,0,8,6)的总体均数 μ 的无偏估计()
A. 2.4
B. 3.1
C. 3
D. 4
__________visitors is an important part of the receptionist's daily _______.
A. Receiving , routine
B. Receive, routine
C. Receiving, business
I'm sorry, I have an __________with my client tommorw afternoon, can we meet on Wendesday?
A. negotiation
B. appointment
C. arguement
How was your flight? Are you feeling any ___________?
A. vomit
B. dizziness
C. jet lag