Are you ___________ with your present salary?[ ]
A. context
B. satisfy
C. glad
D. content
答案:D
出车前的车辆维护属于()
A.一级维护
B.二级维护
C.日常维护
有三只电阻阻值均为R,当二只电阻并联与另一只电阻串联后,总电阻为()。
A.R
B.R/3
C.3R/2
D.3R