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【简答题】
按 I/O 点数及功能形式分类, PLC 通常分为( )、( )和( )。
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C.
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D.
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【简答题】阅读理解。 Last week my youngest son and I visited my father at his new home in Tucson, Arizona. He moved there a few years ago, and I was eager to see his now place and meet his friends. My earliest memor...
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