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保护投资者权益最重要的方面是强化信息披露。投资者有知情权,要求提供完整，准确，及时的有关上市公司，证券产品的信息,对于广大的投资者来说,上市公司信息披露中最重要的原则是()
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已知文法G1＝(VT＝{a,b,d}，VN＝{S，A，B}，S,P)，其中P为： S→dAB A→aA|a B→bB|ε 该文法属于(28)文法。
听力原文： Well, for those of you who went out today, I dont have to tell you it was clear but muggy for most of the state, with high temperatures in the low to mid 90's. The city of Elkview had the high for the day at 97 degrees. And thafs hot. I'm glad I'm working indoors today! For those of you planning outdoor activities tomorrow, you can expect fair skies for most of Saturday with temperatures in the high 90's. However, things might change by Saturday evening with a storm front moving in. We can expect light, scattered showers over the northern part of the state bringing slightly cooler temperatures in the 80's, but this rain should taper off by mid-Sunday morning. It will be partly cloudy for most of the morning, but these clouds should move out by mid-afternoon. Skies should be clear Sunday night, and we recommend catching a glimpse of the partial lunar eclipse. It should start at 10:47 p.m. And that's all for today's weather.
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一个有两个作业管理进程的批处理系统，作业调度采用最高响应比优先的算法，进程调度采用基于优先数(优先数大表示优先级别高)的算法。有以下作业序列：
作业F的运行结束时间为(26)(假定在作业运行期间，除了有空闲的作业管理进程以外，系统不进行调度工作)。
以太网中采用的CSMA/CD算法为(61)。
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