服务员正在接听电话，而客人前来时应（）.
A.不予理睬
B.礼貌示意，尽快结束通话并致歉
C.让客人等候
D.立即挂断电话
参考答案：B
柯氏位摄影，中心线与听眦线夹角是
A．15°B．23°C．37°D．45°E．53°
（74） is the budgeted amount for the work actually completed on the schedule activity or WBS component during a given time period.
A．Planned value
B．Earned value
C．Actual cost
D．Cost variance
