平垫密封分强制式和自紧式二种。
正确
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英语翻译:telecommunications
Whathehaddoneis_______
WhichofthefollowingisnottrueaboutCanada'smanufacturingtoday?
Theprofessorworkedfor7hoursata________.
ThethemeofThanksgivinghasalwaysbeen________.