【单选题】【消耗次数：1】
在8086环境下，对单片方式使用的8259A进行初始化时，必须放置的初始化命令字为（）。
①
ICW1,ICW2,ICW3
②
ICW1,ICW2,ICW4
③
ICW1,ICW3,ICW4
④
ICW2,ICW3,ICW4
参考答案：
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相关题目
【单选题】
在8259A的ICW1、ICW2、ICW3和ICW4中，初始化时可以选写的命令字有（?）。
①
ICW1
②
ICW1和ICW2
③
ICW3和ICW4
④
ICW2、ICW3和ICW4
【填空题】
若8259A中ICW2的初始值为40H，则在中断响应周期数据总线上出现的与IR5对应的中断类型码为[填空1]。
【简答题】
8259A的初始化命令字应按（ 顺序） 写入, 操作命令字应按[填空1] 写入.
【简答题】
设 A = {1, 2=,2, 4=,3, 3=}，B = {1, 3=,2, 4=,4, 2=}，则交关系A∩B等于：[填空1]
【简答题】
设 A = {1, 2=,2, 4=,3, 3=}，B = {1, 3=,2, 4=,4, 2=}，则求差关系A-B。
【简答题】
设 A = {1, 2=,2, 4=,3, 3=}，B = {1, 3=,2, 4=,4, 2=}，则对称差关系A⊕B等于：[填空1]
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changing ?
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to be changed ?
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to change ?
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changed ?
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We have studied English for only one year, ____ we can perform English short play already.?
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With the old man ____ the way, we had no trouble in finding that mysterious cave.
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leading
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How can he ____if he is not ____?
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I like nice and bright weather.
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You don’t like cold weather, do you?
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That was a favorable weather.
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body
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getting financial support
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to get financial support
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in getting financial support
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“Here is the money I promised,” he said. “I always ____ promises.”
①
agree
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follow
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make
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keep
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①
social
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typical
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①
takes on
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picks out