![](https://lstatic.shangxueba.com/jiandati/h5/images/m_q_title.png)
A、150 years old
B、300 years old
C、450 years old
D、600 years old
B.Panel Interview
C.Group Interview-Individual Interview
D.Telephone Interview
The main users of Stock Management System are Instock Administrators, Outstock Administrators, Storage Administrators and System Administrators. Instock administrators are responsible for the registry, update and query of instock journal. Outstock administrators are responsible for the registry, update and query of outstock journal. Storage Administrators are responsible for the registry of Stock ledger, the query of stock information and printing stock reports. System administrators are responsible for user management, data backup and product fundamental information management. Create the system use case diagram and class diagram.
A university has several departments. Each department has several classes and research institutes. Each research institute has several staff members, among which some professors and associated professors supervise some postgraduates. Each class has several students. Each student can opt several courses and each course can be opted by several students. (1)Create corresponding concept model using noun/verb method. (2)Convert the concept model from Question 1 to corresponding database model, described by tables.
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