对收到的外汇汇款查询报文，应在调查落实后于（）个工作日内给予答复。
A.5
B.7
C.10
D.15
参考答案：B
______要求能够快速地建立可以供用户使用并从用户处快速获取反馈信息的可运行模型。
A four-character password consists of one letter of the alphabet and three different digits between 0 and 9, inclusive. The letter must appear as the second or third character of the password. How many different passwords are possible
A．5,040
B．18,720
C．26,000
D．37,440
E．(E) 52,000
