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How much shorter is 2021 calculated to be?

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True or False?A leap second might have to be subtracted from time for the firsttime ever.

What are the most important devices for accurate timekeeping?

When was the last ‘short’ year?

关于把新发展理念贯穿发展全过程和各领域，下列说法中错误的是（）。

A. 要实现更高产能的发展
B. 要实现更有效率的发展
C. 要实现更加公平的发展
D. 要实现更可持续的发展