【单选题】【消耗次数：1】
CPU响应INTR引脚上来的中断请求的条件是（ ）。
①
IF=0
②
IF=1
③
TF=0
④
TF=1
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8086CPU引脚信号中中断请求两个信号名称为[填空1]和[填空2]。
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