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绝对瞬心是作平面运动的两构件上速度为零的重合点。（）
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无序列表、有序列表和项目列表之间不能相互嵌套。( )
转向信号灯的闪光频率应控制在55～110r／min，最为合适的是（）
Task 2Dear Sir/Madam,I am pleased to write a letter of recommendation on behalf of Sand River and its CEO, Mrs. Jane King.I am very familiar with the company. My next book deals with it in detail, which is to be published in autumnof 2018. I am also familiar with European consumer. As a Dutch citizen, I have lived in Europe for 46 yearsand studied European consumer behavior for decades.I believe that Sand River offers something unique to the European market. It has established long-termsupply relations with herdsman (牧民） families and owns advanced German machinery. Thus it combinesnatural resources with modern manufacturing techniques. But equally important, Sand River works withmodern fashion designers to create truly contemporary and appealing designs. The result is a newly-established cashmere (羊绒） brand that appeals to a target group of high-income women.I met Mrs. King the first time in 2013. Since then, we have met several times and talked about SandRiver's philosophy, strategy, and appeal to both Chinese and international consumers. I was struck by herdeep knowledge about knitting(针织） technology, her enthusiasm for the brand, and her deepunderstanding of the cashmere shopper. I regard her as a “woman of her word. "To summarize,I believe Sand River products deserve a place in luxurious European department storesand Mrs. King is a reliable partner.If you have any questions, please do not hesitateto contact me.Sincerely,Joan Smith41. Joan Smith wrote the recommendation letter on behalf of _____________
42. From thc letter we can learn that Sand River_______
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