在电子商务平台联通充值交易中若要做取消交易，需要综合柜员授权，操作应按（）。
A.F5
B.F2
C.F3
D.F7
参考答案：C
–My family had a free vacation in the beautiful city last weekend. We had a lot of fun there.
-- _________.
A．It’s a great pleasure
B．I’m glad to hear that
C．You’re welcome
D．That’s very nice of you
普通型进局光缆一般应预留多长？
