单项选择题

光强分别为和的两束相干光相遇叠加而发生干涉，则叠加区域内的最大光强与最小光强的比值为［］
A、4
B、5/3
C、9
D、2

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单项选择题

On 1 April 20X7, Fino Co increased the operating capacity of its plant. On the recommendation of the finance director, Fino Co entered into an agreement to lease the plant from the manufacturer. An initial payment is made on 1 April 20X7 and the present value of the future lease payments at that date is 100,000 per annum, commencing on 1 April 20X8. The rate of interest implicit in the lease is 10%. The lease does not transfer ownership of the plant to Fino Co by the end of the lease term and there is no purchase option available.Over what period should Fino Co depreciate the right-of-use asset?A、From the commencement of the lease to the end of the lease term B、From the commencement of the lease to the end of the useful life of the plant C、From the commencement of the lease to the longer of the end of the lease term and the end of the useful life of the plant D、From the commencement of the lease to the shorter of the end of the lease term and the end of the useful life of the plant

问答题

事务T1从数据库中读取数据后，事务T2插入或删除了部分记录，当T1再次读取时发现多了或少了某些记录，这两种情况有时称为现象。

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