业务核算必须（）
A.有账有据
B.及时记账
C.当日结账
D.均需由有权人签批后再记账
参考答案：A, B, C
--- Do you mind telling me how to use the function?
--- , It is very easy.
A．You’d better not
B．No, you don’t
C．Of course not
D．No way
