扇形尾的

Effects of different medias on the population growth of three marine ciliates, Euplotes vannus Müller, 1786, Uronema marinum Dujardin, 1841 and Paranophrys magna Borror, 1972, were investigated using experimental ecological method in beef extract and rice grain medium. Analysis of data revealed that the natural growth rate and the population densities of E.

为揭示不同培养液对纤毛虫种群增长的影响，本工作利用实验生态学方法对海水养殖水体中3种常见的纤毛虫原生动物，扇形游仆虫（Euplotes vannus Müller， 1786）、海洋尾丝虫（Uronema marinum Dujardin， 1841）和巨大拟阿脑虫（Paranophrys magna Borror， 1972）在两种培养液中的种群生长过程进行了探讨。

In this paper, the research object is the XM18 spherical generator, in order to improve the dynamic behavior of the machine tool, the following aspects have been studied in this thesis: Firstly, based on the elasticity theory and finite element analysis theory, the finite element models of the lathe bed, dovetail, dovetail shelf, headstock, fanlike plank and millhead shelf, which were the main parts of the spherical generator, were built up using ANSYS9.0. And based on the modal analysis theory and FEM technology, the free modal and the constrained modal analysis of the main parts were studied. Accordance to the analytical results, put forword methods to optimize the key parts.

本课题以XM18球面铣磨机为研究对象，为了提高其动态特性，本文主要从以下几个方面进行研究：首先，根据弹性力学理论和有限元分析的基本理论，利用ANSYS9.0软件建立了铣磨机的主要零部件床身、燕尾、燕尾座、主轴箱、扇形板和磨头座的有限元模型，利用有限元法对主要零部件进行了自由模态和约束模态分析，并根据分析结果对关键部件提出了改进方案。

Long graceful ropes of ivy and grapevine and smilax were hung everywhere, in looping festoons on the walls, draped above the windows, twined in scallops all over the brightly colored cheesecloth booths.

到处垂挂着长串的常春藤、葡萄藤和牛尾藤，在墙壁上围成花环，在窗户上变为翠绿的流苏，在所有用色彩鲜艳的粗布围着的摊位上则盘成扇形的图案。

For the pentagonal, the fifth block fan-shaped, and the remaining three triangular rib angle plate on each side 4, edge angle plate 11 on each side; carapace brown, with three black longitudinal edges; shell and black, its edge angle plate with yellow; both sides of the carapace and the plastron to ligaments connected plastron in the chest, abdomen corner cubicle of the ligaments connected to the Trans-Yi Yi; means, and between the toes with webbed; tail short and pointed.

金钱龟的外型特征是头部光滑无鳞，鼓膜明显而圆；颈角板狭长，椎角板第一块为五角形，第五块呈扇形，余下3块呈三角形，肋角板每侧4块，缘角板每侧11块；背甲棕色，具3条黑色纵棱；腹甲黑色，其边缘角板带黄色；背甲与腹甲两侧以韧带相连，腹甲在胸、腹角板间亦以横贯的韧带相连；指和趾间具蹼；尾短而尖。

The marginal division was a flat fan-shaped structure with a volume of (0.48±0.02) mm3, a maximum rostral-caudate axis of 1.6 mm, a maximum dorsal-ventral axis of 2.158 mm, and a widest axis (the diameter at lateral-medial coronal brain section) of 0.17 mm. The marginal division also moved progressively externally from the rostral section to the caudate section, but its scope was larger than that of others. The whole marginal division changed evenly from the rostral section to the caudate one. Its flat structure widened progressively and its dorsal-ventral diameter narrowed gradually and became plate-shaped.

边缘区呈现一个片状扇形结构，体积为(0.48±0.02) mm3，最大嘴尾径为1.6 mm，最大背腹径为2.158 mm，最大内外径为0.17 mm；同尾壳核和苍白球一样从嘴侧到尾侧随着脑平面的增宽边缘区亦逐渐向外侧移位，其移位的幅度亦明显大于脑平面增宽的幅度；整个边缘区从嘴侧到尾侧呈均匀变化，其片状逐渐变宽，长度逐渐变小，从而形成一个盘状结构。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。