单证人员应严格遵守在收到单据次日起（）个工作日内对外办理付款、承兑、拒绝付款或拒绝承兑的有关规定。
A.5
B.10
C.15
D.20
参考答案：A
When you are on the bus to work in the morning, smile to the people sitting beside you, you will get his smile ______.
A．in place
B．in need
C．in return
D．in relief
电缆穿导管敷设时，管子的两端应( )。
A．加装护圈
B．填塞油麻
C．做喇叭
D．用耐酸材料密封
