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问题 单项选择题

吸烟产生的烟雾中含有许多有毒有害物质，其中有多少种是致癌和促癌物质？（）

A.70种

B.69种

C.68种

答案

参考答案：B

问答题

Caz is a director of Dull plc, but she also carries out her own business as a wholesale supplier of specialist metals under the name of Era Ltd.Last year Dull plc entered into a contract to buy a large consignment of metal from Era Ltd. Caz attended the board meeting that approved the contract and voted in favour of it, without revealing any link with Era Ltd.Required:Analyse the situation explaining any potential liability that Caz may have in relation to the sale of the metal to Dull plc by Era Ltd.(10 marks)
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单项选择题

某排水公司项目部承建的1km雨水管线改造工程，采用φ400双壁波纹管，管道基础为砂垫层，设计支承角为180°。改建后的管底高程为地表以下3m。基层以下地层为湿度小的黏性土。工程施工部位路面宽8m，要求施工期间不得中断交通，采用设置土壁支撑方法施工。

根据管基设计支承角采用中砂回填的厚度应为( )，De为管外径。

A．0.15De

B．0.25De

C．0.50De

D．0.75De
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