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"直三棱柱ABC-A1B1C1中，∠ACB=90°，AC=AA1=a，则点A到平面A1BC的距离是"

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One-Of-A-Kind Ciara Baby Doll And Accessory Set One-Of-A-Kind Ciara Poseable Baby Doll With Extra Outfit
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$59.99 US
One-Of-A-Kind Ciara Baby Doll Ping Lau "One-Of-A-Kind Ciara" Lifelike Poseable Baby Doll
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One-Of-A-Kind Ciara Baby Doll And 10-Piece Accessory Set One-Of-A-Kind Ciara Deluxe Set With Outfits & Diaper Bag
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