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最少一下也不用听。
bingle
(bingle)
看看表针就可以。:P
(#267484@0)
Last Updated: 2001-11-19
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出一道题，限30s内回答----一个正点报时的大钟，几点就敲击几下，每两下之间5s间隔，问：1）如果要确定是否12点，从第一声起，至少要听几下？2）如果要确定是否6点，从第一声起，至少要听多长时间？
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