高手来!三道数学几何二面角的问题.1.在三棱锥P-ABC中,AB⊥BC,AB=BC=1/2PA,点O、D分别是AC、PC的中点,OP⊥底面ABC,则直线OD与平面PBC所成角的正弦值为( )A.根号21 / 6 B. 8根号3 / 3 C. 根号210 /
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![高手来!三道数学几何二面角的问题.1.在三棱锥P-ABC中,AB⊥BC,AB=BC=1/2PA,点O、D分别是AC、PC的中点,OP⊥底面ABC,则直线OD与平面PBC所成角的正弦值为( )A.根号21 / 6 B. 8根号3 / 3 C. 根号210 /](/uploads/image/z/8317098-18-8.jpg?t=%E9%AB%98%E6%89%8B%E6%9D%A5%21%E4%B8%89%E9%81%93%E6%95%B0%E5%AD%A6%E5%87%A0%E4%BD%95%E4%BA%8C%E9%9D%A2%E8%A7%92%E7%9A%84%E9%97%AE%E9%A2%98.1%EF%BC%8E%E5%9C%A8%E4%B8%89%E6%A3%B1%E9%94%A5P-ABC%E4%B8%AD%2CAB%E2%8A%A5BC%2CAB%3DBC%3D1%2F2PA%2C%E7%82%B9O%E3%80%81D%E5%88%86%E5%88%AB%E6%98%AFAC%E3%80%81PC%E7%9A%84%E4%B8%AD%E7%82%B9%2COP%E2%8A%A5%E5%BA%95%E9%9D%A2ABC%2C%E5%88%99%E7%9B%B4%E7%BA%BFOD%E4%B8%8E%E5%B9%B3%E9%9D%A2PBC%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E6%AD%A3%E5%BC%A6%E5%80%BC%E4%B8%BA%EF%BC%88+++%EF%BC%89A.%E6%A0%B9%E5%8F%B721+%2F+6+++++B.+8%E6%A0%B9%E5%8F%B73+%2F+3+++++C.+%E6%A0%B9%E5%8F%B7210+%2F)
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