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【简答题】
商业汇票只能用于商品交易的结算，不可用于劳务结算。（ ）
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【单选题】---He's already been back from the USA, ___________? ---___________. He is having fun with his son at home these days. A.hasn't he; No B.isn't he; Yes C.hasn't he; Yes D.isn't he; No
A.
.hasn't he; No
B.
.isn't he; Yes
C.
.hasn't he; Yes
D.
isn't he; No
【单选题】The incremental model of the software process is _____________.软件过程的增量模型是_____________。
A.
Suitable to the situation when the requirement is defined explicitly.
B.
A good method for quickly constructing executable software product.
C.
Suitable for the software product which is developed by a large team.
D.
A model which cannot be used at present.
【单选题】在网络体系结构中，第N层协议利用(24)提供的服务向(25)提供服务。对等实体是指(26)。数据在同一个系统自上层传到下层，这种数据格式称为(27)。IEEE802局域网协议的结构提供对高层的支持，屏蔽了具体的媒体和访问控制方法。为连到局域网上的端系统提供端到端的差错控制和流量控制的层次是(28)。
A.
(N+1)层协议
B.
N层协议
C.
(N-1)层协议
D.
物理层
【单选题】—Ben hasn't been to such a beautiful place before, has he? —______. [ ]
A.
Yes, he hasn't
B.
Yes, he has
C.
No, he haven't
D.
No, he has
【简答题】环形折返线:俗称()
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