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Mathematics for IGCSE & O level - Time (Section 1 - No. 17)
What time in 12-hour clock format is 0421?
4.21 a.m.
4.21 p.m.
04.21 a.m.
04.21 p.m.
解释
Times before noon (midday) are a.m. and times in the afternoon are p.m.
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