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As a result of analysis to many of the results of experiment, checked up on specimens, field investigation and combining with the theories of palaeobotany, comparative morphology, evolutional morphology of vascular plants and taxonomy, it can be concluded as following: the primitive sorts of Cycadaceae are the sorts that pinnate leafs are dichotomy; among these, the sort that pinnate leafs are tripinnate-dichotomy is most primitive, from this sort gradually evolve to bipinnate-dichotomy, to only for monopinnate-dichotomy, from this sort evolve to the sorts that pinnate leafs are simply pinna; among the sorts of simply pinna, the species that segments of megasporophyll possess much more triplicate to monodichotomy are most primitive.
经过大量的实验结果分析、查阅标本和野外调查,结合古植物学、比较形态学、演化植物学和分类学等理论进行分析,认为苏铁科原始的类型为羽叶呈二歧状分叉的种类,其中最原始的又是羽叶呈三回二歧状分叉的种类,从这个羽叶类型逐渐演化出一回二歧状分叉的羽叶类型,再演化出羽叶为单羽状的类型;而单羽状叶的类群中,又以大孢子叶侧裂片具三回、二回及一回二歧状分叉数量多的种类为最原始,而侧裂片二歧状分叉数量少的为较进化,侧裂片无二歧分叉的如拳叶苏铁类为最进化的种类。
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MELL Oil Group Limited is located in Wuxi to expand the business in China.
为进一步加大工业和民用润滑油产品的开发及推广,德国MELL国际石油集团在无锡设立了MELL国际石油集团有限公司,利用无锡既处在以上海为龙头的都市经济圈内,又位于长江经济走廊苏锡常中心的优势地位,使进口石油化工产品业务能迅速地在中国大陆全面展开。
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What brings about this curious order that comes without compulsion, without planning, without deliberate mentation?
是什么力量带来这个奇妙的秩序而又不需要强迫、计划及刻意的安排?
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The magmatic activity provided not only metallogenetic materials but also mineralizing fluids and thermal power.
岩浆活动既提供了大量的成矿物质,又为成矿系统提供了成矿流体及热动力。
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The Penobscot, Passamaquoddy, Micmac, and Maliseet tribes of Maine are known as the Wabanaki Indians, or "People of the Dawn."
缅因州内的皮纳布斯高族、帕萨马科迪族、米克马克族及马里细特族又名瓦班纳基族印地安人,或「黎明一族」。
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In chapter two, under non-Lipschitz condition, the existence and uniqueness of the solution of the second kind of BSDE is researched, based on it, the stability of the solution is proved; In chapter three, under non-Lipschitz condition, the comparison theorem of the solution of the second kind of BSDE is proved and using the monotone iterative technique , the existence of minimal and maximal solution is constructively proved; in chapter four, on the base of above results, we get some results of the second kind of BSDE which partly decouple with SDE, which include that the solution of the BSDE is continuous in the initial value of SDE and the application to optimal control and dynamic programming. At the end of this section, the character of the corresponding utility function has been discussed, e.g monotonicity, concavity and risk aversion; in chapter 5, for the first land of BSDE ,using the monotone iterative technique , the existence of minimal and maximal solution is proved and other characters and applications to utility function are studied.
首先,第二章在非Lipschitz条件下,研究了第二类方程的解的存在唯一性问题,在此基础上,又证明了解的稳定性;第三章在非Lipschitz条件下,证明了第二类BSDE解的比较定理,并在此基础上,利用单调迭代的方法,构造性证明了最大、最小解的存在性;第四章在以上的一些理论基础之上,得到了相应的与第二类倒向随机微分方程耦合的正倒向随机微分方程系统的一些结果,主要包括倒向随机微分方程的解关于正向随机微分方程的初值是具有连续性的,得到了最优控制和动态规划的一些结果,在这一章的最后还讨论了相应的效用函数的性质,如,效用函数的单调性、凹性以及风险规避性等;第五章,针对第一类倒向随机微分方程,运用单调迭代方法,证明了最大和最小解的存在性,并研究了解的其它性质及在效用函数上的应用。
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Vascular endothelial cells and monocyte play an important role in the initiation of tissue factor pathway, which is also associated with the development of hypertension.
血管内皮细胞及外周血单核细胞与组织因子途径的启动关系密切,而二者又与高血压的病理过程密切相关。
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When the ratio of ignorant dropped to 1/r , the proportion of knowledge disseminators reached the maximum, and then the proportion of communicators tends to decrease, ratio of ignorant monotone decreasing.
本文又从以企业为企业集群网络节点的角度,在复杂网络统计理论的基础上,研究了聚类系数与特征路径长度及模块化对集群网络知识传播的影响。
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Ka'anapali beach is beautiful; we strolled and swam at a small bay with fishes and coral, and watched the sunsets… Have you ever seen a moonset?
Kaanapali 沙滩很美,又可在细沙上漫步、在海湾游泳看鱼及珊瑚、看日落…你看过月落吗?
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Too much self-inspection leads to morbidness; too little conducts to careless and hasty action.
太多的自我检查会导致病态;过少的自我检查又会导致行为的粗心大意及轻率盲动。
- 推荐网络例句
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This one mode pays close attention to network credence foundation of the businessman very much.
这一模式非常关注商人的网络信用基础。
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Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.
扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。
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There is no differences of cell proliferation vitality between labeled and unlabeled NSCs.
双标记神经干细胞的增殖、分化活力与未标记神经干细胞相比无改变。