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DBS是一个大的系统。他包括：
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数据库三级模式中，可以存在“多个“的模式是哪个？
视频中提到了哪些主流的数据库系统？
视频中提到，1970年诞生了直到目前为止最重要、最主流的一类数据库，他是：
If you’re looking for ways to improve your products or services, customers can be one of your most valuable sources of information and market research（研究）, so why not take it a step further and visit some of them?Ideally, you want to do this in person, so you may need to offer your customers something for their time. They may be pleased that you take their opinion seriously, and they may also enjoy getting a chance to help influence your products or services, If your customers are in different places, you could make such visits part of your business travel to get a wider range of responses.One expert recommends（建议）that you make your customers feel comfortable during the visits. You’re not trying to sell anything through these meetings, so plan to spend 80 percent of your time listening.Don’t try to lead your customer to give responses that you really want to hear. Instead, ask questions that focus on the customer’s experience such as whether they got what they were hoping for and what they found difficult or enjoyable.1. According to the passage, your customers can be very helpful in____.A. expanding your businessB. reducing your production costC. selling your products or servicesD. improving your products or services2. In the first paragraph, the author suggested _____ .A. paying a visit to some customersB. finding out sources of informationC. advertising your products or servicesD. carrying out various market researches3. Your customers may feel happy if you ______.A. take them as your good friendsB. treat their opinions seriouslyC. offer quick responsesD. visit them regularly4. According to the expert, the way to make your customers comfortable during the visit is_______.A. to promise them the best priceB. to explain your sales plan to themC. to spend most of your time listeningD. to tell them the advantages of your products5. The focus of your questions during the visit should be on_________.A. the development of your businessB. responses that you want to hearC. the customer’s experienceD. your future sales plan
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