这个好
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胡萝卜营养丰富。有治疗夜盲症、保护呼吸道和促进儿童生长等功能。此外还含较多的钙、磷、铁等矿物质。生食或熟食均可。还可腌制、酱渍、制干或作饲料。
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题目修改 spinach   (308 bytes , 287reads )
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if you know sth about stochastic, this is a stopping-time problem 1300cc   (102 bytes , 285reads )
试着写一般表达式,这样对吗? spinach   (79 bytes , 244reads )
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yes. it's a typo in my first equation. should be -2 , not -1/2 1300cc   (15 bytes , 292reads )
it's in this way 1300cc   (67 bytes , 372reads )
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no draw 1300cc   (192 bytes , 256reads )
我的答案跟大家一样4:1;可是好像不对 spinach   (521 bytes , 260reads )
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考虑到状态稳定的时候 icky   (102 bytes , 288reads )
这个好 胡萝卜   (0 bytes , 240reads )
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