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（本小题12分）如图,四棱锥P-ABCD是底面边长为1的正方形，PD ⊥BC,PD=1,PC= . （Ⅰ）求证:PD⊥面ABCD； （Ⅱ）求二面角A－PB－D的大小.
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举一反三
【简答题】vt.使暴露,揭露____
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On 1 January 2...
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【单选题】At 31 December 20 15 Q, a limited liability company, owned a building that had cost $800,000 on 1 January 2006 . It was being depreciated at two per cent per year. On 31 December 20 15 a revaluation t...
A.
Depreciation charge Revaluation reserve for year ended 31 December 20 16 as at 31 December 20 15 $ $ 25,000 200,000
B.
Depreciation charge Revaluation reserve for year ended 31 December 20 16 as at 31 December 20 15 $ $ 25,000 360,000
C.
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D.
Depreciation charge Revaluation reserve for year ended 31 December 20 16 as at 31 December 20 15 $ $ 20,000 360,000
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