短时间

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究结果表明：基于串励直流电动机(来源：ABC21论文网www.abclunwen.com)的电动拖拉机电驱动系统的驱动力特性场接近理想驱动力特性场，其各挡下的驱动力特性是一组下凹的曲线，低速恒转矩，高速恒功率；同一行驶速度下所对应高挡驱动力大于低挡驱动力，这是由电机的调速特性决定的；电动拖拉机各个挡位下具有较广的稳定作业速度范围，但是各个挡位之间速度重合的范围较多，说明所用变速箱变速比与电动机匹配不合理；电动拖拉机最大爬坡度达到30%以上，并且各挡爬坡度变化范围较广，作业过程中不需要频繁换挡；影响电动拖拉机连续作业时间的因素较多，其中作业行驶速度和作业负荷影响最为明显，作业负荷越大，连续作业时间就越短，作业速度越快，连续作业时间就越短。2、电动拖拉机驱动特性仿真研究。

In conclusion, the lag phase of Streptococcus thermophilus was shorten in the eutrophy culture medium, and the time achieving the culminated point of logarithmic phase was shorted also, at the same time, the stationary phase lengthened. After secondary culture, Streptococcus thermophilus reached directly the log phase hardly through the lag phase, and then quickly reached the decline phase. There were more relations of the metabolic regalities of the three kinds of nutritive substances with the super-concentrated incubation process of Streptococcus thermophilus: the more the number of the bacteria, the quicker the metaboling, while the fewer, the slower the metabolism. Moreover, there apparently existed morphologic changes in this course, and there maybe existed the apoptosis, which correlated with bacteria propagation and acid producing. With the culture time postponed, the nutritive substances in the culture medium lacked also, and the morphologic change and apoptosis appeared more obviously.

结果表明，嗜热链球菌在营养丰富的培养基中的生长延滞期缩短，到达对数生长顶点的时间变短，稳定期的时间延长，当经过二次培养后，嗜热链球菌几乎不经过延滞期直接到达对数期，平稳期持续的时间较短，很快到达衰亡期；嗜热链球菌在超浓缩培养过程中三大营养物质的代谢规律也同它的培养过程有很大的关系，菌数多，其代谢旺盛，菌数降低其代谢速度减慢；嗜热链球菌在超浓缩培养过程中存在着明显的菌体形态变化，并可能存在着细胞凋亡，与菌体增殖和产酸规律密切相关，随着培养时间延长，培养基中营养物质变得贫乏，菌体形态变化和细胞凋亡的情况愈加明显。

The surgical duration ranged from 35 to 170 min ［mean=（92.3±25.6） min］; amount of blood loss during operation was 50-700 ml ［mean=（120.0±36.3） ml］. The earliest time of anal exsufflation was 9 h after operation and the last was 27 h. The postoperative morbidity was 12.6%. The hospital stay ranged from 5 d to 9 d ［mean=（7.2±1.6） d］.

手术时间最长170 min，最短35 min，平均(92.3±25.6) min；术中出血50～700 ml，平均(120.0±36.3) ml，术后肛门排气时间最短9 h，最长27 h，术后病率12.6%，住院时间最短5天，最长9天，平均(7.2±1.6)天。

The authors performed 3D photographic measurement on the technical moves of ZHANG Wen-xiu as an excellent female hammer thrower in China to get relatively comprehensive body movement data by using two JVC3000 high-speed cameras, screened and analyzed the data by using SPSS software, and revealed the following findings: in terms of such technical parameters as spinning time, spinning track and spinning speed, there were some problems with this player, which restricted the enhancement of her performance, such as the double leg supporting time was shorter than the single leg supporting time; the angle of inclination of the track of various swirls (espe-cially the first swirl) was somewhat too big; the accelerating process was too short; too much attention was paid to acceleration at the single leg supporting stage; the spinning at the double leg supporting stage was too fast; the sus-tainable accelerating power was not high.

摘 要：采用两台JVC3000高速摄像机对中国女子链球优秀运动员张文秀的技术动作进行三维摄影测量，获得较为全面的人体运动学数据；运用SPSS软件对数据进行筛选和相关分析，发现该运动员在旋转时间、轨迹和速度等技术参数方面存在着一些制约成绩提高的问题，诸如双支撑时间短于单支撑时间、各圈(尤其第1圈)的轨迹倾角偏大、加速过程太短、单支撑阶段过于强调加速及双支撑阶段旋转过快、持续加速能力不强等。

Domestic entrance, adult college entrance examination, self-examination and the examination of various institutions, some criminal elements to use cell phones to cheat; in the test set MDPB-04-based mobile phone signal isolator, can be effective in blocking the process of examination of the types of mobile phone signal transmission, because cell phone signals within the scope of the test was cut off, any test can not answer the phone, view from outside the examination room phones, text messages; can not make calls, send text messages; guarantee test the order of category 2 intermediate and high school students to use cell phone text messages during school hours in the classroom hair set edsun-2008-type devices to block mobile phone signals, through the mobile phone signal blocking devices to block mobile phone signals, the mobile phone so that students can not receive text messages, send text messages to ensure that students can concentrate on in the classroom full time in a limited guarantee that the quality of teaching.

国内高考、成人高考、自学考试及各类大专院校在考试过程中，一些不法分子利用手机作弊；在考场中设置MDPB-04型手机信号隔离器，可在考试过程中有效阻断各种类型的手机信号的传输，由于手机信号在考场范围之内被隔断，考场内的任何手机都无法接听、查看来自考场以外的电话、短信息；也无法拨打电话、发送短信息；保证考场秩序2类中级、高级中学学生利用手机在上课时间乱发短信在教室中设置edsun-2008型手机信号阻断器，通过手机信号阻断器的阻断手机信号的功能，使学生的手机无法接收短信、发送短信，保证学生能够在课堂上集中精力，充分在有限的时间内保证教学质量。

Domestic entrance, adult college entrance examination, self-examination and the examination of various institutions, some criminal elements to use cell phones to cheat; in the test set MDPB-04-based mobile phone signal isolator, can be effective in blocking the process of examination of the types of mobile phone signal transmission, because cell phone signals wit你好n the scope of the test was cut off, any test can not answer the phone, view from outside the examination room phones, text messages; can not make calls, send text messages; guarantee test the order of category 2 intermediate and 你好gh school students to use cell phone text messages during school hours in the classroom hair set edsun-2010-type devices to block mobile phone signals, through the mobile phone signal blocking devices to block mobile phone signals, the mobile phone so that students can not receive text messages, send text messages to ensure that students can concentrate on in the classroom full time in a limited guarantee that the quality of teac你好ng.

国内高考、成人高考、自学考试及各类大专院校在考试过程当中，一些非法分子利用手机做弊；在科场中设置MDPB-04型手机信号断绝器，可在考试过程当中有用阻断各类类型的手机信号的传道输送，因为手机信号在科场规模以内被隔绝，科场内的不论什么手机都无法接听、查看来自科场以外的电话、短信息；也无法拨打电话、发送短信息；包管科场秩序2类中级、高级中学学生利用手机在上学时间乱发短信在教室中设置edsun-2010型手机信号阻断器，路程经过过程手机信号阻断器的阻断手机信号的功效，使学生的手机无法吸收短信、发送短信，包管学生能够在课堂上集中精力，充分在有限的时间内包管讲授质量。

When the aphids were feeding on Ww2730 seedlings, the time to 1st probing was delayed compared to those on Xiaoyan22 and Batis, searching was interrupted before 1st probing, and 1st probing was shorter than that on Xiaoyan22 and Batis significantly. Duration of pd Ⅱ-1 on Ww2730 and Xiaoyan22 was much longer than that on Batis. Duration of pd in C waveforms on Ww2730 was longer than that on Xiaoyan22 and Batis remarkedly. Times and duration of G waveform on Ww2730 were more and longer. Times of spot G waveform on Batis were more than on Ww2730 significantly, but the duration was shorter than those on Xiaoyan22 and Ww2730. Total time of E1 waveform, max longest duration of E1 fractions and mean duration time of E1 fractions following E2 wavefrom on Xiaoyan22 and Batis were all longer than on Ww2730 statistically. There were no differenences among mean durations of 1st E1 wavefrom on three varieties, but mean durations of other E1 waveforms on Ww2730 and Xiaoyan22 were shorter than those on Batis. The other waveform parameters, include times and durations of F and E2 were all not different on three wheat varieties.It is suggested that the resistance mechanism of wheat variety Ww2730 to S.

麦长管蚜在品种Ww2730上口针开始接触叶面时间显著晚于小偃22和Batis，第1次持续刺探前的刺探次数显著多于小偃22和Batis，开始刺入叶面后第1次刺探的持续时间极显著短于小偃22和Batis；在Ww2730和小偃22上的PdⅡ-1的平均时间显著长于Batis；Ww2730上C波阶段2个Pd波间的间隔平均时间显著大于另外2个品种；在Ww2730木质部取食的次数和时间显著大于其它2个品种；Batis上的点G波的次数极显著地高于Ww2730，而平均持续时间极显著短于小偃22和Ww2730；在Batis和小偃22上E1波的总时间，E1波的最大值、跟随E2波的E1波的平均时间均显著大于Ww2730；3个品种间第1次E1波持续的时间差异不显著，但Ww2730和小偃22上其它E1波持续的时间极显著少于Batis；3个品种上其它波形参数，包括F波的次数和总时间、E2波的次数和总时间没有差异。

The results revealed that screwdrivers with triangle shaped handle could help subjects produce the maximum torque. Besides, using screwdrivers with hexagon shaped handle spent the least time, generated the minimum biceps muscle activity, and bad the least subjective fatigue rating. Moreover, wearing an anti-static glove or being barehanded can produced the maximum torque and spent the least time as well. Experiment 2 evaluates the handle diameter of screwdriver (30 mm, 34 mm or 38 mm) and operation plan. The results showed that the torque increased with the increase of the radius, the operation time and the brachioradialis muscle activity also increased with the increase of the radius.

本 研究共分为三次实验，实验一分析握把造型(八角形、锐角六角形、圆角六角形、枪型、圆角三角形)与手套(棉质手套、防静电手套、赤手)的影响，结果显示三角形造型握把可产生最大扭力，六角形造型握把的锁附螺丝时间最短、二头肌肌肉活动度最低、主观整体疲劳评比最低，防静电手套与赤手状态的扭力最大并且锁附螺丝时间最短；实验二比较握把直径(30 mm、34 mm、38 mm)与作业面的影响，结果显示直径越大扭力越大，但直径越小锁附螺丝时间则越短，且肱桡肌肌肉活动度越低。

The colonized time of Ol. Opisthopora and Coleoptera were 8.42 and 6.45 months at mixed forest respectively, while Hymenoptera and Collembola were 9.48 and 7.91 months respectively at Chinese fir forest.

后孔寡毛目在杉木混交林凋落物中集聚的时间最长，鞘翅目集聚的时间最短，分别为8.42和6.45个月；膜翅目在杉木纯林凋落物中集聚的时间最长，弹尾目集聚的时间最短，分别为9.90和7.91个月。

And abortion rate,efflux time of gestation sac,time of colporrhagia and returning menstruation, adverse reactions were examined.results the abortion rate,efflux time of gestation sac,time of colporrhagia and returning menstruation in three groups didn't have significant difference.but adverse reactions in them were shown significant difference.the complete abortion rate of pregnancy women less than 6 weeks was higher than that of 6～8 weeks.conclusion shorter course of treatment,minor response were shown.group a possesses advantages of short time,exact effect and little side effect,especially in less than 6 weeks duration of pregnancy.

结果：三组完全流产率、孕囊排出时间、出血时间及月经复潮时间差异无显著性；a组妊娠小于6周者完全流产率与妊娠6周～8周者相比差异有显著性；疗程短者出现副反应小，三组差异均有显著性。结论：米非司酮服用时间越短，其胃肠反应与头晕乏力等副作用越小；a组具有用时短、疗效确切、副作用小等优点，尤其对孕周小于6周患者流产效果好。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。