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防滑器系统主要由（）主机、排风阀、压力开关等四部分组成。
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目标管理的第一步是：()。
Dear Jone, I am writing to apologize(1)my immediate going home after the exam(2)saying goodbye to you．It was very rude(3)me to do so especially as we have been such good friends. You know, shortly after the exam, I received a telephone call(4)my father, saying that my elder sister had borne a baby the day before．I was so pleased(5)this news that I couldn't wait to get home to see my elder sister and my niece．I left in such a hurry that I didn't have time to tell you．I feel terribly sorry(6)that. To make(7)for my thoughtless behavior toward you, I want to invite you to come and stay(8)my family during the vacation．My hometown is located(9)a city(10)the seashore and this is the most beautiful season of my hometown. I believe you can understand me and accept my sincere apologies．How I wish I could see you soon in my hometown! Please write and let me know your decision.Yours,
函按行文方向可以分为来函、（）、复函。
（）是中国工人阶级的先锋队。