任慧英 2021-01-12 04:44 千足金和万足金的区别首先在于其含金量多少。万足金:含金量大于等于999.9‰，在黄金饰品、金条上开发者_运维技巧出现的印记是“AU9999”或“金9999”。千足金:含金量大于等于999.0‰的
What is a regular expression for strings of 0 and 1 with an even number of zeros and an even number of ones?
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