账单生成及派送，是指对客户电费的处理过程包括（）
A.电费发行
B.生成客户账单
C.打印
D.派送
参考答案：A, B, C, D
No decision（）about any future appointment until all the candidates have been interviewed.
A. will be made
B. is made
C. is being
D. has been made
用filp-flop和logic-gate设计一个1位加法器，输入carryin和current-stage，输出carryout和next-stage.
