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单选题 When an engineer has designed a new product, a model of the design is built to assure the manufacturer that the design is really workable. Building a model is often expensive, but the tools for starting actual production are so expensive that the manufacturer cannot risk the investment without having tested the design by ______
A. a model
B. a factory
C. an engineer
D. a survey

学科:23-24-2工程学科英语
时间:2024-05-26 14:46:21
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