Constant窗口掃描模式的3個連續(xù)的掃描周期。注意整個掃描時間可能因邏輯窗口掃描時間的不同而不同，但是為通訊窗口和后臺窗口指定的時間是常數(shù)。因為窗口時間為常數(shù)，所以一個周期內某些窗口可能跳過，暫緩或者執(zhí)行多次。

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