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Results The mortality rate of mice in 80 mg/kg, day cyclophosphamide group was 16.7%, and T level [ at 30th day :( 1.38 ± 0.31 );45th day:( 1.15 ± 0.26 ) ] and T/LH ratio [ at 30th day:(0.163 ± 0.014); 45th day:(0.127 ± 0.023 ) ] were significantly decreased (all P<0.05) at 30th day after induction;The concentration of MDA [at 15th day:(2.70 ± 0.41);30th day:(2.710.36);45th day:(2.67 ±0.43) ] was maintained at a high level (all P<0.05) during the 45 days ; Number of Leydig's cells [ at 15th day:(9.65 ± 0.75 ); 30th day:( 14.05 ± 0.67 ); 45th day:(8.49 ± 072)] and layers of spermatogenetic epithelia [ at 15th day:(4.75 ± 0.82);30th day:(3.60 ± 0.49);45th day:(3.74 ± 0.43 ) ] were significantly decreased ( all P < 0.01 ) and stabilized in a low level. The induced model was stable and the mortality rate was acceptable. In the 60 mg/kg, day cyelophosphamide group, the T level and T/LH ratio had no significant change (P > 0.05 ), and the concentration of MDA ,number of Leydig' s cell and layers of spermatogenetic epithelia recovered at 30th day after induction. The induced model was unstable.
结果 剂量每日为80 mg/kg体重小鼠成模后死亡率为16.7%,血清T[30 d:(1.38±0.31);45 d:(1.15±0.26)]及T/LH比值[30 d:(0.163±0.014);45 d:(0.127±0.023)]于诱导后第30天出现显著下降(P均<0.05),而诱导后睾丸组织内MDA含量[15 d:(2.70±0.41);30 d(2.71±0.36);45 d:(2.67±0.43)]维持高水平(P均<0.05),生精上皮层次[15 d:(4.75±0.82);30 d:(3.60±0.49);45 d:(3.74±0.43)]和间质细胞[15 d:(9.65±0.75);30 d:(14.05±0.67);45 d:(8.49±0.72)]均显著减少(P均<0.01)并稳定于低水平,模型稳定,死亡率适当;每日60mg/kg体重组小鼠血清T及T/LH比值于不同时段并未出现明显变化(P>0.05),且睾丸组织内MDA含量、生精上皮层次和间质细胞计数在30 d后有所恢复,模型不稳定;每日100 rag/ks体重组死亡率为30.0%,死亡率过高。
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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。
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Many nation call"great occasion of nation stanza" or"National Day", have some a nation call"independence day" or"independence stanza", also have of call"republican day","republic day","revolution day","liberation day","nation renew stanza","constitution day"...etc., also have direct with country plus "day" of, like"Australia day","Pakistan day", have of with king of birthday or mount the throne a day for National Day, such as meet a king to substitute, great occasion of nation of concrete the date also immediately replace.
许多国家叫"国庆节"或"国庆日",还有一些国家叫"独立日"或"独立节",也有的叫"共和日"、"共和国日"、"革命日"、"解放日"、"国家复兴节"、"宪法日"等,还有直接以国名加上"日"的,如"澳大利亚日"、"巴基斯坦日",有的则以国王的生日或登基日为国庆日,如遇国王更替,国庆的具体日期也随之更换。
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working day:工作日
"工作日"(working day) 指不属以下日子的任何日子─(b)全日或其中部分时间有黑色暴雨警告的日子,而"黑色暴雨警告"(black rainstorm warning) 指由香港天文台台长藉使用通常称为黑色暴雨警告讯号的暴雨警告讯号而发出的关于在香港或香港附近出现暴雨的警告;
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working day:工作天
"工作天"(working day) 指任何并非以下日子的日子─ (2003年第44号法律公告)(b)>(第1章)第71(2)条所界定的烈风警告日或黑色暴雨警告日;"上诉人"(appellant) 指根据第3条送达上诉通知书的人;
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working day:营业日
操作的定义为:以市场实时之汇率成交,交割日(value day)在交易日(trading day)后两个营业日(working day). 交易的地点:全球各地商业银行外汇部门. 在外汇交易操作的过程中不但可以买涨也可以卖跌(沽空)等等. 操作的定义为:以市场实时之汇率成交,
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working day:从星期一到星期五的一段时间
off-day 星期六和星期日 | working-day 从星期一到星期五的一段时间 | from 配置时间段的起始时间点
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working day, workday:工作日
labour law 劳工法 | working day, workday 工作日 | full-time employment, full-time job, full-time work 全天工作
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