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Any letters beyond these requirements are to be excluded, so if the decree specifies k comparisons then the new alphabet will contain the first k+1 lowercase letters of the current alphabet. Create a class Alphabet that contains the method choices that takes the decree as input and returns the number of possible new alphabets that conform to the decree. If more than 1,000,000,000 are possible, return -1. Definition Class: Alphabet Method: choices Parameters: string Returns: int Method signature: int choices Constraints decree contains between 1 and 25 characters inclusive.
我注:如上面的BAA有3个字符,那么新表就有4个,也就是'd'后面的全被忽略创建一个名为Alphabet的类,此类含有一个名为choices方法,choices方法以&规定&作为参数输入,然后返回所有符合这个规定的新字母表的可能数,如果大于1,000,000,000可能,就返回-1 定义:类名:Alphabet 方法:choices 参数类型:string 返回值类型:int 方法签名:int choices (确保choices为公有方法)参数条件:规定中的'B'和'A'总和必须大于等于1,小于等于25 举个例输入:&BAA&返回:3 解释:因为根据规定'a'在'b'的前面,'b'在'c'的后面,'c'在'd'的后面,所有符合这个规定的新字母表有3个:adcb、dacb和
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Based on the results of information investigation, the paper briefly summarizes the research and application of cell engineering technology in agriculture: Chromosome engineering,protoplast culture,anther culture, cell culture, tissue culture and somatic hybridization. The worldwide development and progress in the application of cell engineering in plant breeding are reviewed.
根据文献研究结果,系统地综述了染色体工程技术、原生质体培养、花药培养、细胞培养与无性系筛选、组织培养与体系胞杂交等细胞工程技术,在国内外农作物育种上开发应用后所取得的新进展、新成果,以及这些新成果的产业化,对促进中国农业生产的发展所起的作用。
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He also created the"plumcot". a fruit that is half plum and half apricot;four newtypes of quince tree; ten new kinds of plums and prunes; and anew kind of nut.
他还创造出一种&李子杏&,这是一种一半是李子味一半是杏味的水果;此外还有四种新的温柏树、十种新的李子树和梅子树,还有一种新坚果。
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It took part in a great number of construction projects and urban design projects in recent years, including the Shenzhen City Plaza, Shenzhen Public Art Square, Shenzhen HE Xiangning Art Museum in OCT and etc.
都市实践力图为新世纪建筑和城市所面临的新问题提供新的解决办法。
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In addition, the value of new business, the Chinese counterpart of the safety of the new business at 14 times the value of the multiplier; China Life new business value of the corresponding multiplier for 33 times, 18 times that of China Pacific Insurance; assessment Value has become conservative, he thought the insurance industry in China due to policies of protection, as opposed to other industries, in this round of economic adjustment, the insurance industry the impact would be relatively small, the effect will become a safe haven.
此外,新的商业价值,新业务的安全中对应的14倍乘数的价值;中国人寿新业务价值相应的33倍,18倍乘数对中国太平洋保险,评估价值变得保守,他认为,由于在中国的保护政策,而不是其他行业在这一轮的经济调整,保险业,保险业的影响将相对较小,效果会成为一个安全的避风港。
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In this paper Ⅰ successfully applied these methods to fault diagnosis, and presenting some new innovative machinery fault diagnosis method; First Ⅰ present a new gear wornout fault diagnosis method, this method use the vibration signal's time-frequency attribute and instantaneous phase undulation to accurately detect gear's fault, and by comparing with the traditional frequency domain analysis method, this method reveals that many nonlinear and nonstationary characteristic exist in gear's vibration, this tell us that if we use frequency domain analysis method without pay attention to the signal's characteristic, we could get wrong diagnostic result; Then Ⅰ present a new bearing fault diagnosis method, this method use ATVFD and Hilbert transform to do envelop demodulation,Ⅰ analyze the envelop with time-frequency method and find out that this method is more accurate then traditional method.Ⅰ also explain that the modulation of the fault to the carrier wave may also be non-stationary and nonlinear; Finally Ⅰ present a cylinder pressure measurement method of diesel engine by means of vibration, cylinder pressure is an important parameter of diesel engine fault diagnosis, the pressure measuring is simplified a lot by this method,Ⅰ also use the ATVFD and time-frequency analysis to realize it.
本文中将上述理论方法成功地应用到故障诊断中去,提出了几点创新性的诊断方法;提出了一种齿轮磨损故障诊断的新方法,该方法利用振动信号能量的时频域分布特征与瞬时相位波动特征可以进行精确的齿轮故障诊断,并通过与传统的频域诊断方法的比较,揭示出齿轮振动中存在的明显的非线性与非平稳特征,说明了不加选择地利用频域分析方法进行齿轮故障诊断很可能会得到错误的诊断结果;提出了一种轴承故障诊断的新方法,该方法利用ATVFD分解与Hilbert变换进行包络解调,并对解调得到的包络信号进行时频域分析,可以实现更加准确轴承故障诊断,说明了故障对载波信号的调制往往也是非平稳与非线性的;提出了一种利用振动信号进行柴油机汽缸内压力检测的新方法,柴油机汽缸压力的变化是柴油机故障诊断的重要参数,利用振动方法可大大简化汽缸压力的检测过程,该方法也是综合利用ATVFD分解与时频域分析方法实现的。
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We cannt get result on how to change course and speed to make collision avoidance, this can help little on collision avoidance decision.The article aims at the default on Radar simulator and implements the standard result on Radar simulator by making use of MCU.the main production is below:First, we calculate how to chang course and speed on the destine point by MCU. We get the new course and new speed on the destine point,we get the point to resume original course and speed, we get the distance and azimuth to resume original course and speed on given course and speed, the six essential: DCPA, TCPA, distance, azimuth,real speed and real course.
本论文针对当前雷达模拟器标绘训练中的不足,实现了利用单片机进行雷达模拟器标绘标准值的计算,主要成果有以下方面:首先,利用单片机计算得到了在预定点改变航向和改变航速的计算,求得预定点改向的新航向C_N和预定点变速的新速度V_N,恢复原航向和原航速的时机点的计算;在给定避碰的新航向、航速的条件下,计算出恢复原航向/航速的时机点H的距离R_H和方位θ_H;目标船的六要素,即DCPA、TCPA、距离R、方位θ、真航速V_T和真航向C_T。
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The new year, the economic situation has risen, as the country's strict control on the real estate market, local public policy changes to adjust the project tender, bank deposit reserve ratio increases and a series of policy, will certainly poised to be hair cast a shadow over the economic situation in a new layer of shadow, electrical industry, will also generate new round of attacks.
新的一年,经济形势有所起色,但随着国家对房地产市场的严格控制,地方公变项目的招标政策调整,银行存款准备金率上调等一系列政策的实施,势必给蓄势待发的经济形势笼罩上一层新的阴影,也将给电气行业产生新一轮的冲击。
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Subsidiary, a total of four business segments: one is just listed kyoko resources, mainly the production of Glauber's salt-based; another one is based on the Proton in the heavy industry in Sichuan Xinjin mainly involved in special vehicles, bridge components, building machinery, new energy, petrochemical equipment industry, Hyundai Heavy Industries Company; third block is based on the production of new materials of special polymer-based PPS, in Shuangliu, Deyang has 31,000 tons production base, this piece of or will be available in September of this year; fourth block, then is the main oil-producing machinery and equipment company, is currently settled in places are being selected, which may be settled in Nanchong in Sichuan.
而腾中重工的母公司四川华通投资控股有限公司的实际掌门人就是李炎。在李炎控制的四川华通投资控股有限公司旗下,共有四大业务板块:一块是刚刚上市的旭光资源,主要以生产芒硝为主;另外一块是以四川新津的腾中重工为主,涉足特种车辆、道桥构件、建筑机械、新能源、石化设备产业的现代重工企业;第三块则是以生产PPS高分子特种新材料为主,在双流、德阳拥有3.1万吨产量的基地,这块或将于今年9月份上市;第四块,则是以生产石油机械设备为主的公司,目前落户地正在选择当中,可能会落户于四川南充。
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Manufacturers meet the growing demand for better women's body armor with new designs, new technology and a unique line of new products
制造商用新设计,新技术和独特的系列新产品满足不断增长的更好的女士防弹衣的需求
- 推荐网络例句
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By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.
到它被攻陷的时候,里面多数的犯人是写了反对政府贪污文章的作家。
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The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.
在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色,卵在发育96h后卵基本全部孵化。
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There was a conflict between plebs and patricians in ancient Rome in 494BC.
在公元前494年,罗马发生了一次平民反对贵族的斗争。