在四棱锥P-ABCD中,PA⊥底面ABCD,底面ABCD为矩形,其中PA=AB=AD=2,若M,N分别为线段PB,PD的中点,Q为底面ABCD内一动点(包括边界),则(OM)•(ON)的取值范围是 [1/2,5]. 相关知识点: 试题来源: 解析 解:以A为坐标原点,以PA所在的直线为z轴,AB所在的直线为x轴,AD所在的直线为y轴,∵PA=AB=AD=2...
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2.如图,在正方形ABCD中,AB =4,M是AD的中点,点P是CD上一个动点,当∠APM的度数最大时,CP的长为M AD PB C第2题图
平面直角坐标系中,M(36,0),⊿OMN是等腰直角三角形,∠ONM=90° (1) 直接写出N的坐标; (2) 正方形ABCD是⊿OMN的内接正方形,求正方形边长; (3) 在(2)的情况下,点P为线段AB上一点,以P为圆心,PB为半径的圆交线段AD于点E.当B,E,N在一条直线上时,求⊙P半径; ...
20.Asymmetric Oxo-Bridged ZnPb Bimetallic Electrocatalysis Boosting CO2-to-HCOOH Reduction. 不对称氧桥 ZnPb 双金属电催化促进 CO2 还原为 HCOOH。 21.Synergistic Binary Fe–Co Nanocluster Supported on Defective Tungsten Oxide as Efficient Oxygen Reduction Electrocatalyst in Zinc-Air Battery. ...
13.如图,在正方形ABCD中,AB =4,M是AD的中点,点P是CD上一个动点,当∠APM的度数最大时, CP的长为 4-2√2A M D PB C
• These Devices are Pb-Free, Halogen Free and are RoHS Compliant 类似零件编号 - MC12026ADR2 制造商部件名数据表功能描述 ON SemiconductorMC12026ADR2 130Kb/6P1.1 GHz Dual Modulus Prescaler January, 2006 ??Rev. 8 MC12026ADR2G 130Kb/6P1.1 GHz Dual Modulus Prescaler ...
因为DEC平面DEF,所以DE∥平面PBC.(4分)法二 取PB的中点M,连接CM,ME.在△PAB中,PE=EA,PM=MB,所以EMI∥-AB-|||-,I-|||-2.P-|||-E-|||-C-|||-A-|||-B在直角梯形ABCD中,CD∥AB,且AB=4,CD=2,故AB-|||-2,所以EMIICD,(2分)所以四边形CDEM为平行四边形,故DE∥CM.因为CMC平面PBC,...
(18-, 16-, or 8-bit bus) and serial 5 V/3.3 V/2.5 V interface SPI®/QSPI™/MICROWIRE™/DSP compatible Single 2.5 V supply operation Power dissipation 75 mW typical @ 2 MSPS with internal REF 2 µW in power-down mode Pb-free, 48-lead LQFP and 48-lead LFCSP Speed upgrade ...
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