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问题 选择题
下列说法中，正确的是（　　）
A．在Rt△ABC中，锐角A的两边都扩大5倍，则cosA也扩大5倍
B．若45°＜α＜90°，则sinα＞1
C．cos30°+cos45°=cos（30°+45°）
D．若α为锐角，tanα=
5
12
，则sinα=
5
13
答案

A、在Rt△ABC中，锐角A的两边都扩大5倍，但它们的比值不变，所以cosA值不变，故本选项错误；

B、应为若45°＜α＜90°，则

2
2
＜sinα＜1，故本选项错误；

C、三角函数的度数不能直接相加，故本选项错误；

D、根据tanα=

5
12
设两直角边为5k、12k，根据勾股定理得斜边为13k，所以sinα=
5
13
，故本选项正确．

故选D．

问答题

The auditors of Dunce Ltd signed the balance sheet of the company, which grossly overstated the value of the stockin-trade, at the end of each year. The auditors had relied, without further enquiry, on certificates regarding the value of the stock-in-trade which were issued by the company secretary. The company has now gone into liquidation and it is clear that the company has no assets to pay its creditors. Empire Bank Ltd alleges that it relied on Dunce Ltd’s financial statements for increasing the overdraft facilities to it. The auditors are now being sued by Empire Bank to make good the loss it has suffered for not being able to recover the money advanced to Dunce Ltd.Required:Advise the auditors on their potential liability for professional negligence. (10 marks)
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单项选择题 案例分析题

1960年河石肉类公司诉兰开夏郡船运公司（曼克斯特城堡）原告的150箱罐装牛舌，由被告的曼克斯特城堡号承运，货物装船时状态良好，航程中遭遇恶劣天气，使船舶发生摇晃，抵达目的港卸货时发现113箱货物因海水进入而损坏。该轮在开航前，曾进过修船厂，由劳埃德船级社验船师进行特检及年检。检验时全船31个防浪阀被开启，但检验后修船厂的钳工未将第5舱中两个防浪阀检查帽旋紧，海水正是从此处涌入的。

上议院对承运人的适航义务的解释是（）。

A.承运人必须承担绝对适航的义务

B.承运人必须克尽职责使船舶适航

C.承运人的适航的义务是不可转委托的
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