琵拉大沙丘坐落于法国西南部波尔多市(0°34′E ，44°50′N )的大西洋畔

Ari is a metal broker who was in negotiations with three parties for the sale of a large consignment of copper he was expecting to receive on 15 March.On 1 March he wrote to the three clients Bas, Cas and Das.He wrote to Bas offering to supply the copper at $6,000 per tonne for orders over 100 tonnes for delivery to be made before 1 May. Bas immediately wrote back ordering 75 tonnes for delivery on 30 April.He wrote to Cas offering 100 tonnes of copper at $6,500 per tonne if he placed an order before 1 May. Cas also immediately wrote back ordering 150 tonnes at the agreed price for delivery on 30 April.He wrote to Das offering to supply him copper at $6,750 per tonne and Das immediately wrote back ordering 150 tonnes for delivery on 1 May.After he had sent the above letters and before he received the replies Ari discovered that he would not be able to secure the delivery of the copper.Required:Advise Ari as to his potential liability to Bas, Cas and Das under the above situations, assuming that the United Nations Convention on Contracts for the International Sale of Goods applies. (10 marks)

对于平衡体系mA（g）+nB（g）⇌pC（g）+qD（g）；△H＜0，下列结论不正确的是（　　）

A．若温度不变，将容器的体积缩小到原来的一半，此时A的浓度为原来2倍，则m+n＞p+q

B．若平衡时，A、B的转化率相等，说明反应开始时，A、B的物质的量之比为m：n

C．若m+n=p+q，则往含有amol气体的平衡体系中再加入amol的B，达到新平衡时，气体的总物质的量等于2a

D．若温度不变，压强增大到原来的2倍，达到平衡时，总体积一定比原来的

脆化

周律师于2001年取得了律师执业资格，并一直在一家律师事务所担任刑事律师。2005年，周律师为帮助自己的朋友，以非律师身份从事了相关的法律服务，根据周律师的情况，司法行政机关应当依据有关法律如何进行处理

A．不予追究

B．给予相应的处罚

C．给予鼓励

D．判处刑罚

应激性溃疡的首发症状为（）

A.出血

B.腹泻

C.呕吐

D.便秘

E.食欲缺乏