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PECB 相关知识点: 锐角三角函数 锐角三角函数应用 解直角三角形的应用 解直角三角形的实际应用 坡度坡角问题 试题来源: 解析 24.(I)证明:设底面菱形ABCD对角线相交于O,连接OE,∵E为PC中点,O为AC中点∴在△CPA中,OE为PA边的中位线∴OE∥PA ,又OEC平面EDB,∴ ∴PA∥ 平面EBD.(Ⅱ)证明: ∵PD⊥ 面...
"PECB has built a strong reputation in the international market for its expertise and ability to develop and deliver trainings on many ISO standards," said Eric Lachapelle, CEO of PECB. PECB Signs a Partnership Agreement with ALFINEX This partnership will assist PECB and A4S, a reputable organi...
【解答】P E M B证明:(I)∵E,F分别是PC,PD的中点∴EF∥CD又∵AB∥CD,∴AB∥EF,又∵EF⊄平面PAB,AB⊂平面PAB;∴EF∥平面PAB;解:(Ⅱ)取线段PA中点M,连接EM,则EM∥AC故AC与平面ABEF所成角等于ME与平面ABEF所成角的大小作MH⊥AF,垂足为H,连接EH∵PA⊥底面ABCD,∴PA⊥AB又∵AB⊥AD,PA∩A...
PEcB如图,在四棱锥P-ABCD中,底面ABCD是菱形,且∠ABC=120^{\circ}.点E是棱PC的中点,平面ABE与棱PD交于点F.(Ⅰ)求证:AB/\!/EF; (Ⅱ)若PA=PD=AD=2,且平面PAD⊥平面ABCD,求平面PAF与平面AFE所成的锐二面角的余弦值. 相关知识点: 立体几何 空间向量与立体几何 二面角的平面角及求法 二面角求法 ...
PECB如图,在四棱椎P-ABCD中,PD⊥平面ABCD,CD∥AB,CD⊥DA且PD=DA=AB=12DC=2.设PB中点为E.(1)证明:平面PBD⊥平面PBC;(2