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题目内容
（乐山师范学院专业英语 A卷）
An economical method of organizing much of the subject matter of chemical engineering is based on two facts: ①although the number of individual processes is great, each one can be broken down into a series of steps, called operations, each of which in turns appears in process after process; ②the individual operations have common techniques and are based on the same scientific principles.
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