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秦岭地区10种百合科植物核型报道 总被引：1，自引：0，他引：1
本文对秦岭地区的Polygonatum的2种，Hosta的2种和Smilax discotis，Cardiocrinum
giganteum，Asparagus filicintus，Reineckia carnea，Tupistra chinensis，Rohdea japonica做了核型分析。其中有4种的核型为国内首次报道。本义对不同产地的玉竹gonatum odoratum)的核型进行了对比，讨论了其核型进化的可能途径。 相似文献
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大庾岭是历代文人墨客贬谪南迁和北归的必经之路,具有深厚的文化积淀。本文通过对苏轼南迁和北归越过大庾岭时写的诗来分析苏轼晚年的人生态度和价值观的变化,以及揭示苏轼过大庾岭写的诗在"苏诗"中的地位。 相似文献
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随着中国改革开放,外来文化传入,汉语吸收了大量外来语,其中日源外来语占据不可忽视部分。探析改革开放以来汉语中日源外来语发展史及定义、典型例子、使用人群、使用载体和借入方式、新时期日源外来语增多原因和我们应秉持的态度:汉语已有词能完美表达的就不借;借是为了丰富汉语、准确达意和表达特殊效果。 相似文献
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以扬州市职业大学学生为样本,对高职院校学生的英语产出性词汇习得状况开展实证研究,发现：1.议论文文体的习得水平高于记叙文文体;2.英语专业学生的产出性词汇习得水平并不比非英语专业学生具有明显的优势;3.女生的产出性词汇习得水平不比男生具有明显的优势;4.二年级学生的英语产出性词汇习得水平还略低于一年级学生;5.严重依赖字母A到F开头的单词,过度依赖词汇表的字母顺序来记忆单词,缺乏有效的单词记忆方法。 相似文献
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Anwar H. Joarder 《Teaching Statistics》2009,31(2):55-58
This article demonstrates that the variance of three or four observations can be expressed in terms of the range and the first order differences of the observations. A more general result, which holds for any number of observations, is also stated. 相似文献
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《European Journal of Sport Science》2013,13(1):45-50
Abstract The aim of this study was to investigate the acute effects of a vibration-assisted static stretching intervention on enhancing split range of motion in gymnasts matched on initial range of motion. Twenty-two female artistic gymnasts (mean age 13.8 years, s=2.3) matched for age (±6 months) and competitive level were randomly assigned to a static stretching intervention with or without simultaneous vibration. The test consisted of adopting a forward split position with the rear leg bent to 90° and held vertically against a matted block while the pelvis remained perpendicular to the lines of the two legs. The gymnast was instructed to descend into the lowest split position of her comfortable pain tolerance. Positions were videotaped and digitized creating an angle between the split legs. The stretching intervention consisted of a forward split position with emphasis on the front leg hamstring muscle group, followed by a forward lunge position with emphasis on the rear leg quadriceps muscle group. In each position, four sets of stretches were completed each of 10 s duration with 5 s of rest between sets. The experimental group performed stretches with the vibration device turned on while the control group performed the same stretches with the vibration device turned off. A pre-test was performed to obtain baseline scores with the post-test following immediately after the vibration or control stretching intervention. Difference scores were calculated between the pre-test and post-test for each gymnast, and compared between groups using independent t-tests. Results showed significant post-test differences between the vibration and non-vibration groups (mean difference 12.2±5.2° vibration vs. 7.8±3.5° non-vibration, P=0.030) in the non-dominant limb, but no significant differences in the dominant limb (mean difference 10.2±4.3° vibration vs. 7.9±6.1° non-vibration, P=0.32). Vibration-assisted static stretching may provide a greater stimulus for range of motion improvements in limbs that have a lower initial level of flexibility. 相似文献
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关于范围副词,学术界有不同看法。虽然有人认出为应取消范围副词,但更多的人从范围副词的定义、类型、语义指向及语义制约、范围副词修饰名词等问题进行了深入的研究,使范围副词的研究深度和广度有了很大的改观。 相似文献
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《治安管理处罚法》中的警察自由裁量权 总被引：1，自引：0，他引：1
《治安管理处罚法》授予丁警察大量的自由裁量权，同时，对警察自由裁量权的控制也有许多新的措施和办法。尽管如此，在警察自由裁量的授予与控制方面，仍有不少问题，拟就《治安管理处罚法》中的警察自由裁量权作初步探讨。 相似文献
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发制品生产是一个古老而"新兴"的产业,本文结合染整设备节能减排和技术升级改造的需求,深入研究发制品染整生产工艺和特点,研发出发制品行业专用的新型多功能染整联合设备。该设备的成功投产,明显提高生产效率,为企业节能降耗提供强有力的保障,加快推进发制品行业设备的机械化和自动化进程,有较高的市场推广价值。 相似文献