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【单选题】
正跳沿检测指令“---( P )--- <地址>”,当信号状态由0变化到1时,则产生正跳沿,检测元件接通时长为( )。
A.
保持接通
B.
保持断开
C.
接通一个扫描周期
D.
断开一个扫描周期
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【单选题】Being in hard times, which of the following is NOT true?
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B.
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C.
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D.
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【单选题】两种商品可以按一定比例相交换的原因,在于它们 ( )。
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a. A person’s disposition plays a significant role in recovery.
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b. Even a little progress should be rewarded so as to give you confidence.
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