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Giving two equal-intense stimuli which is higher than the threshold stimulus and whose intervals are longer than the single twich period, two independent contracting curve can be observed. Giving two equal-intense stimuli which is higher than the threshold stimulus and whose intervals are longer than the refractory period, an additive-contracting curve can be observed. Giving several equal-intense stimuli which is higher than the threshold stimulus, tetanus curve can be observed.

当给予两个等强度的阈上刺激，且刺激的间隔大于单收缩的时程，在计算机中可以观察到两个独立的收缩曲线；当给予两个等强度的阈上刺激，且刺激的间隔小于单收缩的时程而大于不应期，在计算机中可以观察到两个收缩曲线的叠加，称为收缩的总和；当给予若干个等强度的阈上刺激，在计算机中就可以观察到强直收缩曲线。

The results above showed:(1) The cultivars of large-flowered chrysanthemum are widely distributed in Beijing area with plentiful floral types and floral colors;(2) The cultivars with the rare types and colors are urgent for protection;(3) Most of the quantitative characters obeys to the normal distribution,some important traits agreed with skewed distribution.The probability grading can assist quantitative character in establishing new grading standards;(4) Most of qualitative characters is asymmetrical in cultivars,which might be caused by unbalanced differentiation of characters or linkages coming from emphasis characters selection;(5) The floral characters are relatively stable and have comparably large influence on classification,the characters of stipule also have a certain degree of stability and can act as an reasonable supplement for cultivars classification,but the foliar characters have worse stability and can only be recognized as lower level criterion.(6) The genetic relationship among the Flat-petaled group,the Quilled-petal group and the Spoon-petaled group are closest,which followed by the Filiform-petal group because of long-term selection pressure for the specialization of the petal tip loved by most people.The Anemone-petal group has further genetic relationship with these four groups.(7) ISSR molecular marker detection indicates that the proportion of polymorphic loci of lardge-flowered chrysanthemum is higher,in which the Flat-petaled group has the highest genetic diversity level.

综合以上的研究结果表明：(1)北京地区现有大量大菊品种，且花型与花色较为丰富；(2)珍稀花型、花色品种亟需保护；(3)大部分数量性状是符合正态分布的，少数重点观赏性状迫于选择压力呈现偏态分布，概率分级法能够辅助大菊的数量性状建立新的分级标准；(4)大部分质量性状在品种群内的分布是不均匀的，可能是由菊花性状遗传分化的不均衡性或受到选育重点性状的连锁作用而造成的；(5)大菊花部性状相对稳定，对品种分类影响较大，其托叶部分也具有一定程度的稳定性，可以作为品种分类的合理补充，而叶部性状稳定性较差，在品种分类中应作为更次一级的分类依据；(6)平瓣类、管瓣类和匙瓣类的亲缘关系最近，畸瓣类品种花瓣先端特化受到人们的喜爱，长期的选择压力使其区别于3种基本瓣型，而这四种瓣型与桂瓣类在亲缘关系上较远；(7)ISSR分子标记检测表明：大菊品种多态性位点百分率较高，平瓣类品种的遗传分化最为丰富。

Fifth can drink one small bowl Heimi gruel , stirabout just before going to bed , contain large amount of vitamin and amylum inside , can promote body inner insulin secretion , can give cerebrum the effect hypnotizing.

第五 临睡觉前可以喝一小碗黑米粥、玉米粥，里面含有大量的维生素和淀粉，可以促进体内胰岛素的分泌，能给大脑以催眠的作用。

Fluorescent fixtures are the most effective way of maintaining a high level of diffused light but they don't have to be ugly or expensive,according to Dupuy.Inexpensive fluorescent stirp lighting can be set into architectural elements such as coves and valances,providing an economical source of ambient light.He stresses the importance of using color-corrected lamps whenever possible."We can't replicate incandescent light,"he says,"but we can get a warm tone that makes people feel comfortable."

荧光灯固定装置，是最有效的办法，保持高水平的弥漫轻，但他们并没有被丑陋或昂贵的，据dupuy.inexpensive荧光stirp照明可设定成建筑元素，如coves和valances ，提供了一种经济来源周围light.he强调，必须利用彩色校正灯只要有可能，"我们不能复制灯泡"，他说，"但我们能得到许多热情的口气，让人感到舒服"。

Fluorescent fixtures are the most effective way of maintaining a high level of diffused light but they don't have to be ugly or expensive,according to Dupuy.Inexpensive fluorescent stirp lighting can be set into architectural elements such as coves and valances,providing an economical source of ambient light.He stresses the importance of using color-corrected lamps whenever possible.We can't replicate incandescent light,he says,but we can get a warm tone that makes people feel comfortable.

答： 荧光灯固定装置，是最有效的方法，保持高水平的弥漫轻，但他们并没有被丑陋或昂贵的，据dupuy.inexpensive荧光stirp照明可设定成建筑元素，如coves和valances ，提供了一种经济来源周围light.he强调，必须利用彩色校正灯只要有可能，我们不能复制灯泡，他说，但我们可以得到许多热情的口气，让人感到舒服。

The heavy oil combustion activator mainly used in heating stove of steel rolled, industrial stove, power plant stove, glass furnace ,metal furnace ,ceramic roller kiln and channel kiln .It can accelerate combustion , prevent over-burning, reduce the harmful gas emission. Its energy-saving reaches to 5-8%. Diesel oil combustion activator mainly used in the diesel oil engine which can strengthen atomization ,improve ignition conditions, adjust the value of cetane,restrict intense or knocking vibrations, reduce the fuel de-compound and black smoke emission, prevent over-burning, carbonization and reduce the machine's friction. Its fuel-saving reaches to 3-5%. High efficiency gasoline combustion activator mainly used in gasoline engine, which can improve the gasoline octane rating ,restrain extensive or knocking vibrations, reduce fuel de-compound , prevent over burning , carbonization, reducing machine's friction and toxic gas or black smoke emission, Its fuel saving reaches to 3-5%.

该产品分为重油、柴油和汽油燃烧催化剂三大类，重油燃烧催化剂主要用于轧钢加热炉，工业锅炉，发电厂锅炉，玻璃熔窑，金属熔炼炉，陶瓷辊道窑，隧道窑中，能够促进燃烧，防止结焦，节能达5-8%，减少有害气体的排放；柴油燃烧催化剂主要用于柴油发动机中，起到增强雾化、改善着火条件，调整十六烷值，抑制隆震爆震，降低燃料分解，防止结焦积碳的作用，同时减少机器磨损，节约燃料3-5%，减少黑烟及有害气体的排放；高效汽油燃烧催化剂用于汽油发动机中，能提高汽油辛烷值，平抑隆震爆震，降低燃料分解，防止结焦积碳，减少机器磨损，节约燃料3-5%，减少有害气体及黑烟的排放。

The results show that homogeneous collagen dispersion can be gained by both methods. But only by the second method can we receive typical cross striation structure which was observed by EM. The solid content and viscosity of the collagen dispersion can be easily controlled.

结果表明：两种方法均能得到均匀的溶胀体，但用酸法提取的材料电镜观察为非横纹结构；而酶消化法提取的材料，电镜照片为典型的横纹结构，胶原溶液的固体含量、粘度等指标可控制。

Fear can hold you prisoner. Hope can set you free. A strongman can save himself.

懦怯囚禁人的灵魂，希望可以感受自由。

You can purchase Parsley juice at herbal sty es and it can be very healthy for you although it might not taste the greatest it can be mixed with ther juices to enhance the flavor.

你可以购买欧芹汁在中草药的商店，它可以为你非常健康，虽然它可能不是最伟大的口味，可以与其他果汁混合，以提高风味。

A low level of disturbance can not bring the obvious changes to the subaerial algae in community interior, intermediate disturbance can increase the species quatities of subaerial algae, but can not change the dominant species of algae community, while the serious or repeated disturbance may alter both the component of species and the dominant species, that is species quatities decrease, and dominant species change.

局部小范围的干扰或轻度干扰不会对群落内部亚生藻类的种类组成产生明显影响；中度干扰可使群落内部的亚气生藻类的种类明显增加，但藻类群落的优势种不会改变；而重度干扰下，植物群落内的亚气生藻类的种类组成及优势种均会发生重大变化，种类数量减少，优势种改变。

London based fashion photographer Matt Irwin might be is the next big thing in fashion photography.

总部位于伦敦的时装摄影师马特欧文可能会是下一件大事的时装摄影。

Based on IMC system,the response would be better if the model matched more satisfactorily.

由于系统基于内模控制设计，故模型匹配度越高，系统响应越好。