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A: When does the patent expire? 专利什么时候终止?
When does the patent expire? 专利什么时候终止？
When does the new law come into operation? 这项新法律何时生效？
When does the birthday party take place? 生日庆祝会什么时候举行？
When does the new system become effective? 新制度何时生效？
When do the new safety rules come into force? 新的安全规则何时生效?
When does the express train leave? 特别快车什么时候开?
When does the new show hit town? 新戏什麽时候可在城里演出?
When does the wash come back from the laundry? 送到洗衣店的衣服什麽时候取回来?
When does the referee award a fall? 在什么情况时裁判员给获胜分?
A: When did the communists take control in China? 共产党是什么时候开始统治中国的?
When did the soccer begin to play as a match? 英式足球什么时候开始成为一项比赛的?
When did the world come into being? 世界是什么时候形成的？
A When does the performance begin? 演出什么时候开始?
When did the empire begin to wane? 那个帝国何时开始衰落的?
When did the universe come into being? 宇宙最初是何时形成的?
When does the rainy season set in here? 这儿雨季什么时候开始?
All of the major derailleur makers incorporated slant parallelograms when the patent expired in 1984. 主要变速器制造商纳入倾斜的平行四边形时，将所有在1984年专利到期。
When did the last time you went to a nail parlor? 最后一次去指甲美容店是什么时候？
When the patent expires,profit margins may he low due to competition,perhaps requiring efficient continuous processing;a scale-up job for ChE. 而当专利过期以后，由于竞争而使利润率下降，这时也许就该用高效率的连续生产方法了，于是放大的工作又交给了化学工程师。