多项选择题

加速器感生放射性主要产生在()。

A.结构材料
B.冷却水
C.周围土壤
D.加速器厅(治疗室)的空气
E.束流传输隧道的空气

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2 Helen Bradshaw, a recent graduate with a degree in catering management, has spotted a market opportunity duringher first job with a large supermarket chain. She knows there is a growing market for distinctive, quality cakes in thebakery sections of the supermarket chains, as well as in supplying independent individual premium cake shops, andalso for catering wholesalers supplying restaurants and hotels.Helen is very determined to set up her own business under the brand name of ‘Helen’s cakes’, and has bought someequipment – industrial food mixers, ovens, cake moulds – and also rented a small industrial unit to make the cakes.Helen has created three sets of recipes – one for the premium cake shop market, one for the supermarkets and onefor the catering wholesalers but is uncertain which market to enter first. Each channel of distribution offers a differentset of challenges. The premium cake shop market consists of a large number of independent cake shops spreadthrough the region, each looking for daily deliveries, a wide product range and low volumes. The supermarkets aredemanding good quality, competitive prices and early development of a product range under their own brand name.The catering wholesalers require large volumes, medium quality and low prices.Helen has learnt that you are a consultant specialising in start-up enterprises and is looking to you for advice.Required:(a) Acting as a consultant, prepare a short report for Helen advising her on the advantages and disadvantageseach channel offers and the implications for a successful start-up. (12 marks)