当公司的实际营业费用少于预计营业费用所产生的利益，称为______。
A．利差益 B．死差益 C．费差益 D．退保收益
参考答案：C
__________at the gate of the theater, Susan found the ticket for the play was left at home.
A．To arrive
B．On arriving
C．As arriving
D．While arrived
建筑内消防应急照明灯具的照度有哪些要求？
