有10根长度不等的木条,每根长度都是整数,最短的为1,最长的为89,现在想用其中的3根平成一个三角形木架,但是不管怎么样都不能拼成,这10根木条中次长的木条长多少?

有10根长度不等的木条,每根长度都是整数,最短的为1,最长的为89,现在想用其中的3根平成一个三角形木架,但是不管怎么样都不能拼成,这10根木条中次长的木条长多少?
有10根长度不等的木条,每根长度都是整数,最短的为1,最长的为89,现在想用其中的3根平成一个三角形木架,但是不管怎么样都不能拼成,这10根木条中次长的木条长多少?

有10根长度不等的木条,每根长度都是整数,最短的为1,最长的为89,现在想用其中的3根平成一个三角形木架,但是不管怎么样都不能拼成,这10根木条中次长的木条长多少?
因为不能拼成三角形,所以10根的长度分别是：1,2,3,5,8,13,21,34,55和89.
次长的为55
从第三个开始每个都是前两个数的和.因为三角形性质是两边之和大于第三边,当两边之和=第三边时,组不成三角形

Large-scale oil extraction plant engineering safety assessment


ononlarge-scaleoilextractionplantengineeringZUOQing (GuangzhouGreenOilCo., Ltd., 510110Guangzhou, China) Abstract: Vari...

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Large-scale oil extraction plant engineering safety assessment


ononlarge-scaleoilextractionplantengineeringZUOQing (GuangzhouGreenOilCo., Ltd., 510110Guangzhou, China) Abstract: VariousofthedangerousandharmfulfactorsaleanalysedaccordingtothesafetyproductionevaluationspecificationfromthestatesafetyproductionGeneralBureauandtheregulafionoftheoilextractionplant, andthefactors & reprofessionallyevaluatedbythereferencefromAmericanevaluationregulation, theprecautionistakenbythewayofsafetymanagementforsmoothlyprocessingduringen ~ neefing. Keywords: safetyevaluation; extractionplantengineering; dangerousandharmfulfactors; safetymanagement :1003 -7969 (2005) 10-0029-04 CLC number: TS224.4 Document code: A pre-plant soybean extraction plant should be included in a hazardous environment and to conduct risk zoning Zhu Aijun, Fu Shuping, Wang Naiyi (1 National Food Reserve Wuhan Science Institute, 430 079 South Road, Wuhan Zhuodao 3; 2 Valley Oil Co.,dsquared sito ufficiale, Ltd. in Dongguan,mbt scarpe milano, Dongguan City,puma scarpe, Guangdong Province, 523147; 3 national food reserves Oil Research Institute of Xi'an Bureau, Xi'an 710082) Abstract: The leaching plant for soybean pretreatment workshop analysis and the experimental data that the soybean dust is dust, pre-treatment plant should be included in the dangerous environment. Meanwhile, dust explosion-proof against domestic and foreign standards, the danger of pre-workshop for zoning. Key words: dust; dust; dangerous environment; hazardous area classification system for soybean oil companies are using the oil extraction method, solvent extraction using 6 or n-hexane. The flash point of less than 28 ℃, lower than 10%, with a flammable,fake oakley sunglasses, under certain conditions, potentially significant. Therefore, in accordance with hazard classification as a Class C. Be noted that, power. distribution Received :2005 -06-28 Author: Zhu Aijun (1969 A), male, engineer; mainly engaged in electrical engineering design work. electric lines, lighting, fire, emergency lighting and evacuation signs, automatic fire alarm devices and fire control room), etc., accounted for part of the key in the prevention of the location of the electrical device. In the first 1O. 2.1O article clearly states: specific environment, should be classified hazardous area,ghd italia, all electrical equipment (including motors, sensors, line, quilts, buttons, etc.) and installation type should meet the GB50058-1992 <

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