解:延长BC交AD于H.A-|||-C-|||-B-|||-J-|||-H-|||-M-|||-D-|||-N-|||-E-|||-图2在Rt△CDH中,∵DH:CH=1:0.75,CD=0.5,∴DH=0.4,CH=0.3,∴BH=1.3,在Rt△ABH中,cos63°=BH-|||-AB,∴AB≈2.9(米),故选D.[点睛]本题考查解直角三角形的应用,解题的关键是理解仰角俯角的...
A .Skim th etex tan dchoos eth epurpos eo fth ewrite rt owrite the passage. A .Skim th etex tan dchoos eth epurpos eo fth ewrite rt owrite A .Skim th etex tan dchoos eth epurpos eo fth ewrite rt owrite A .Skim th etex tan dchoos eth epurpos eo fth ewrite rt owrite ...
Directions :Liste n toth efollowin gconversation san dchoos eth ebes tanswe rt oeac ho fth equestions.Th econversation san dth equestion swil lb erea donl yonce.1 . A . B ysubway. B .By car. C. B ybicycle D .By bus.2 . A .Trave linsurance. B .Dangerou sareas C .Extrem...
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Directions :Liste nt oth efollowin gpassag ean dchoos eth ebe stanswe rt oeac hquestion .Th epassage wil lb erea dtwice ,bu tth equestion swi llb erea donl yonce.6 . A .9 0interview so fyoun gpeople. B .10 weeks o flectures. C .19 hour so fvideo lectures. D .10 studie ...
Directions :Liste nt oth efollowin gconversation san dchoos eth ebes tanswe rt oeac ho fth equestions.Th econversation san dth equestion swi llb eread onl yonce.1 . A .I n afrui tstore. B .I n agym. C . A t arestaurant. D . A t awatc hshop.2 . A .Wild animals. B...
[解答]解:如图,过点D作DH⊥AC于点H,个北D→东2645°37°AHBC在Rt△DCH中,∠C=37°,∴CHDHtan37°,在Rt△DBH中,∠DBH=45°,∴BHDHtan45°,∵BC=CH﹣BH,∴DHDHtan37°tan45°6,解得DH≈18km,在Rt△DAH中,∠ADH=26°,∴ADDHC0s26°20km. 答案 答:轮船航行的距离AD约为20km.相关推荐 1...
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nyo uhear:(8分)I .Liste nt oth edialogu ean dchoos eth ebes tanswe rt oth equestio nyo uhear:(8分)I .Liste nt oth edialogu ean dchoos eth ebes tanswe rt oth equestio nyo uhear:(8分)I .Liste nt oth edialogu ean dchoos eth ebes tanswe rt oth equestio nyo uhear:(8分...
Directions :Liste nt oth efollowin gconversation san dchoos eth ebes tanswe rt oeac ho fth equestions.Th econversation san dth equestion swil lb eread onl yonce.1 . A . A departmen tstore. B . A resor thotel. C .An airlin ecompany. D . A governmen tsector.2. A .Exciting...