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A．Follow teachers.B．Freshment of a university.C．Second-year students.D．Either seniors

A. Follow teachers.
B. Freshment of a university.
C. Second-year students.
D. Either seniors or juniors.

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急性梗阻性化脓性胆管炎出现

Software products may be (1)into four basic types: application programs, programming language processors, operating systems, and system utilities.
Application programs are programs that (2) useful tasks such as solving statistical problems, or keeping your company's books.
Programming language processors are programs that (3) the use if a computer language in a computer system. They are tools for the development of application programs.
Operation systems are programs that (4) the system resources and enable you to run application programs.
System utilities are special programs that (5) the usefulness of or add capabilities to a computer.

A. manage
B. perform
C. support
D. reduce
E. divided

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便后肛门部肿物，疼痛明显者为