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The barges, which measure between 20 and 32 metres long (66 to 105ft), had to be cleaned and made seaworthy before they could be towed into place and set on to a platform of sediment.
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1:4 和 4:1 的尺寸，同样适合用来生成各种特定物体的图片。
There's lots of Moon on display tonight, so plenty of opportunity to do some Moon gazing. With just your naked eye, you'll be able to see the Mares Tranquillitatis, Vaporum and Serenitatis. With binoculars you'll also be able to see the Mare Nectaris, and the Alphonsus and Endymion Craters, and with a telescope you'll see also see he Apollo 16 and 11 landing spots, and the Rupes Altai.