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招标人与中标人签订合同后（）个工作日内，招标人应当向中标人和未中标的投标人退还投标保证金。
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They were obviously quite impressed by the arguments that the Chinese were advancing（）
We look forward to joining you at the cocktail party at your home on Sunday, March 2, at 8 o'clock p.m（）
在施工成本形成过程中，施工成本分析是指对施工项目成本进行的（）和总结工作。
Most people on Earth accept it fairly easily that US astronauts (宇航员) got to the moon on July 20, 1969. But there are those who do not believe it. The moon rocks were not evidence enough. Neither were the words of the astronauts themselves or the photographs. So the US National Aeronautics and Space Administration (NASA) (美国航空航天局) has asked an expert to write a book to prove that yes, indeed, Americans did land on the Moon. Actually, NASA has been going round and round in the argument for decades, but doubters still could be seen everywhere on the Internet.Those who doubt the Apollo moon landings maintain that the US lacked the technology to send humans to the Moon and was so eager to win the Soviets in the space race that it faked (捏造) the moon mission on movie sets. The doubters say the faking was done so poorly that there is enough evidence of cheat, including a picture of astronauts planting the American flag that shows the flag rippling (微微抖动) in the wind. The doubters claim there can be no wind on the moon, so the picture must have been faked. On its own web, NASA said that when the astronauts struggled to plant the US flag in the moon surface, they twisted it around a bit before it stuck. The rippling looks as if it were being carried by the wind. A NASA’s expert said he has no ideas about whether the upcoming short book will change every doubter’s mind. What statement of the following is true（）
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