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Absolute value is a norm. ( )

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When a computer performs floating-point calculations, large numbers may annihilating decimals, resulting in calculation errors. ( )

When you take a train from Harbin at minus 5 degrees to Wuhan at 5 degrees above zero, you must be at a certain point during the ride when the outdoor temperature is 0 degrees. ( )

A monotonic bounded sequence has a limit. ( )

The four-color theorem means that each flat map can be colored with only four colors, and no two adjacent areas have the same color. ( )