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如图,某几何体的三视图是由三个边长为1的正方形和其内部的一些虚线构成的,则该几何体的体积为(   ).
说明: figure
A.eqId9e311be638c64d4eaed28e15dcba7451B.eqId49b7b111d23b44a9990c2312dc3b7ed9C.eqId5f51ce9cc7fe4412baeb871cceb26665D.与点eqId2efda802d5534f6d92d9f8af7aaec28b的位置有关
已知平面eqIdc13953f2514e4c8f9c8aaaf5241c33ac内的eqIdcaaf85999be749f19125d3a3a2c9a6f4,射线eqIda4133d812272499891a1f8813d5747f8eqIdf83ddc861f1c4f11b2b1c1f071767666所成的角均为135°,则eqIda4133d812272499891a1f8813d5747f8与平面eqIdc13953f2514e4c8f9c8aaaf5241c33ac所成的角eqId50619b805a9743fe980db51e08985a46的余弦值是(   )
A.eqIdf164d28f469f4d97ae98b93ddec1ad21B.eqIde0b8cd3018f64415bea8dce0a25d0538C.eqId18c57999a18a435b8420e97c41639876D.eqId0538e70434fa4b4890d2172bbf2e1041
同步
直线eqId417e80f1349244878d01fe90e0891f5f与平面eqIdc13953f2514e4c8f9c8aaaf5241c33ac所成的角是45°,若直线eqId417e80f1349244878d01fe90e0891f5feqIdc13953f2514e4c8f9c8aaaf5241c33ac内的射影与eqIdc13953f2514e4c8f9c8aaaf5241c33ac内的直线eqIda4be99d332154d13a4a6ed1ff6444fe7所成的角是45°,则eqId417e80f1349244878d01fe90e0891f5feqIda4be99d332154d13a4a6ed1ff6444fe7所成的角是(   )
A.30°B.45°C.60°D.90°
同步
eqId99a3187c2b8f4bcc9703c74c3b72f1f3与平面eqIdc13953f2514e4c8f9c8aaaf5241c33ac所成的角是30°,且eqIdbd7d48a779664a7eb6784326a60794e7,则eqId99a3187c2b8f4bcc9703c74c3b72f1f3eqIdc13953f2514e4c8f9c8aaaf5241c33ac内过点eqIdcc614bd3390c4d028df189b234dcc351的所有直线所成角中的最大角为___________.
同步
如图,已知点eqIdbedf755e0fdb4d078d6859360706b163是正三角形eqId89fbdcb029be4482b52165366491c70f所在平面外一点,eqIdcc7a1b699298468182ff784bb7d57a87eqId790707287e604e1a97e1484c1457c054,则eqIda4133d812272499891a1f8813d5747f8和平面eqId89fbdcb029be4482b52165366491c70f所成的角的大小是(   )
说明: figure
A.90°B.60°C.45°D.30°
同步
如图,在正方体eqId588284d93dc5489295f8f224f8e30d13中,eqId2efda802d5534f6d92d9f8af7aaec28beqId17ceafc9b1a74a37a89907801af1e742eqId41791d084c374fafbe882a6c316914ab的交点,则eqId3be2cc74b5df4257b116d1672859cb5e与平面eqId6b74a67a320746f3818d49426f4b17a6所成的角是(   )
说明: figure
A.eqId0196b94c045446038ce93c014d3378f7B.eqId0196b94c045446038ce93c014d3378f7C.eqIdebeae61755614e058b273658ac03703dD.eqIdd3acaa8971054d1597ffa4f76bc44993
三棱锥eqId12175c05cfe240a0b8270ee03df1962f的底面是以eqIdcf2da96900c948a1b3ce7cbfd420c080为斜边的直角三角形,顶点eqIdbedf755e0fdb4d078d6859360706b163在底面的射影恰好是eqId64b9b599fdb6481e9f8d9a94c102300b的外心,eqId908f0d6e23c1453481f3140571fd53f5,则eqIdc32e6ca0b0dd422d9331c3034c0b82e3与底面eqId89fbdcb029be4482b52165366491c70f所成角的大小为(   )
A.60°B.30°C.45°D.90°