当日对外营业时间内受理的收、付款凭证．必须当天进行账务处理。
参考答案：对
All the students at school are required to ____ lectures by the experts on howto save themselves when accidents occur, such as fires, a gas leak and so on.
A．join in
B．take part in
C．attend
D．participate in
网络适配器（网卡）
