单项选择题

An ______ statement can perform a calculation and store the result in a variable so that it can be used later.

A．assignment
B．executable
C．input
D．output
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单项选择题
Logistics seeks to identify the cheapest way of achieving a given level of ______ or service to customers.
A．avoiding
B．independent
C．related
D．availability
单项选择题
An Enterprise Resource Planning(ERP)is built upon a commercial ______ that promises the seamless integration of all the information flowing through the company——financial, accounting, human resources, supply chain and customer information.
A．managememt system
B．operating system
C．software package
D．middleware
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