【判断题】【消耗次数：1】
在网络图工期－成本优化中，总是先缩短工期-成本斜率最小的工序
①
正确
②
错误
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在进行时间-成本优化时，首先要缩短[填空1]上直接费用最小（低）工序的作业时间。
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“Purchase”and “buy”are not synonyms because “purchase”is more formal than “buy”.
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【单选题】
For formal English we’d better choose _______.
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peculiar words
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obsolete words
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words of intensity
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peculiar idioms
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______ semantics is the interface between lexicology and semantics. It is the most significant part of lexicology and is also the most robust in semantics.
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sentence
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【单选题】
When making a choice of words, a speaker/writer needs to consider the following major factors EXCEPT_______.
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audience
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length of speech
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purpose
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formal and informal English