溃疡型肠结核的主要症状是（） A.慢性腹部隐痛式绞痛 B.午后低热 C.盗汗 D.黏

Ⅰ、用适当的数字和符号填空：

（1）两个氢原子______

（2）三个亚铁离子______

（3）1个水分子______

（4）+4价的氮元素______

Ⅱ、影响物质性质的因素有：A．离子的种类不同      B．分子的构成不同    C．溶质的质量分数不等

请从中选择导致下列物质性质差异的因素（填序号）．

（1）一氧化碳具有可燃性而二氧化碳不具有可燃性：______；

（2）FeCl₂溶液为绿色而FeCl₃溶液为黄色：______；

（3）浓硫酸有吸水性而稀硫酸没有：______．

UML 是一种面向对象的统一建模语言。在UML 中有（51） 四种关系。

A．依赖、关联、特殊、实现

B．依赖、结构、泛化、实现

C．依赖、关联、泛化、语义

D．依赖、关联、泛化、实现

Astride entered into a contract with Bild Ltd to construct a wall around the garden of a house she had just purchased. The wall was to be three metres high to block out a view of a rubbish tip. The wall was due to be finished in May and Astride entered into another contract with Chris to landscape the garden starting on 1 June.Bild Ltd finished the wall on 25 May. However when Astride came to examine it for the first time she found that it was only 2·50 metres high and that the rubbish tip was still visible from the top of her garden.On 1 June, Chris informed Astride that he was too busy to landscape her garden and that she would have to get someone else to do it. The only person available, however, will charge Astride €500 more than Chris had agreed for doing the work.Required:Analyse the scenario from the perspective of the law of contract, advising Astride:

(a) Whether she can require Bild Ltd to reconstruct the garden wall in order to make it the agreed height, and if not, what alternative action is available to her. (5 marks)

在因特网中，屏蔽各个物理网络的差异主要通过以下哪个协议实现？

A．NETBEIU

B．IP

C．TCP

D．SNMP

木工交出的工作面一般有木门窗，木顶棚，木地板外，还有（）等木制品。

A.木格栅

B.木家俱

C.木龙骨

D.木隔断