Rate your tasks into categories using A B C D propriety system.
使用 A B C D 专有系统将您的任务分类。
System B
原声例句
雅思高频场景听写训练
英语百科
CCIR System B
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CCIR System B was the 625-line analog broadcast television system which at its peak was the system used in the most countries. Currently (as of 2012) it is being replaced across Western Europe, Asia and Africa by digital broadcasting.
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