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(1)给出以下结论: ①AH⊥DN;②AD⊥DH;③HM=MN;④DH=NH 你认为正确的结论是 ①④ . (2)请任意选择(1)中的一个正确结论加以证明. 试题答案 在线课程 分析:(1)①④正确; (2)首先根据中位线的性质可得EF∥AB,进而可得△DEM∽△DAN,再根据对应边成比例可得到M为DN中点,再有AD=AN,可根据等腰三角形的...
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A Esmaeili,HA Moghadam,A Golzary 摘要: Desalination methods have become more critical due to the worsening water scarcity problem. Reverse osmosis (RO), forward osmosis (FO), electrodialysis (ED), ion exchange (IX), membrane distillation (MD), multiple effect distillation (MED), and vapor ...
(1)将△ADE绕点A按顺时针方向旋转,使AD、AB重合,得到△ABF,如图1所示.观察可知:与DE相等的线段是 ,∠AFB=∠ .(2)如图2,正方形ABCD中,P、Q分别是BC、CD边上的点,且∠PAQ=45°,试通过旋转的方式说明:DQ+BP=PQ.(3)在(2)题中,连接BD分别交AP、AQ于M、N,你还能用旋转的思想说明BM2+DN2=MN2. ...
John had many hilarious stories to tell of his time as a prosecution solicitor including one concerning a defendant who was up before the bench on a charge of drunk and disorderly behaviour. Thinking that he would help his own cause, the defendant offered the judge the information that he ...
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A deeply scanning of literature has been performed. According to the investigation, the retailing sector generally is organized in two main groups: the retailing within the store and retailing out of the store. Retailing within the store is classified according to different characteristics, but the ...