【单选题】【消耗次数：1】
集散控制系统由单回路仪表控制系统发展起来，主要侧重于开关量顺序控制方面。 （ ）
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错误
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nephews
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cousins
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brothers
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much
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cheap
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it must have rained ?
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?it must rain ?
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it must be raining ?
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it must have been rained?
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to have destroyed
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risen
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