无齿的

Diagnostic characters for the recognition of species include the presence or absence of pectoral fin, the position of dorsal fin origin, gill opening, anus, nostril opening and eye, the cirri present or not, the dentition type, the body coloration, and th

一般依据胸鳍的有无或发达程度，背鳍起点、鳃孔、肛门、鼻孔和眼等的相对位置，颌的发达程度和颌上是否具须，齿的形状和排列方式，身体的斑纹，以及头部和体侧的侧线孔数目等进行鉴别。

It is compared with involute gear most prominent advantage is that the process of meshing gear tooth profile surface there is no relative sliding, so no tooth wear, smooth operation, without the phenomenon of trapped liquid, low noise, long life and high efficiency.

它与渐开线齿轮相比最突出的优点是齿轮啮合过程中齿廓面没有相对滑动，所以齿面无磨损，运转平稳，无困液现象，噪音低、寿命长、效率高。

The expression of Bcl-2mRNA and P53mRNA in hippocampus after 16Hz, 130dB infrasound treatment In 1 day group, Bcl-2mRNA and P53mRNA were expressed lightly in CA1-CA3 areas in hippocampus and dentate gyrus. Blood vessels dilated lightly. In 7d group, Bcl-2mRNA and P53mRNA were more expressed in areas mentioned above. Dilation of capillaries and small vessels was more obvious. Bcl-2mRNA and P53mRNA were strong positive in endothelial cells of vessels. In 14d group, Bcl-2mRNA and P53mRNA expression was obviously increased in pyramidal cells of hippocampus and granular cells of dentate gyrus, showing deep blue staining. a The endothelial cells in some vessels were also strong positive for Bcl-2mRNA and P53mRNA. Dilation of capillaries and small vessels was lessened. In 21d group, Bcl-2mRNA and P53mRNA expression was decreased in pyramidal cells. In 28d group, little change about the expression and distribution of Bcl-2mRNA and P53mRNA was observed. Lots of Bcl-2mRNA and P53mRNA were scattered in cortex of temporal lobe around hippocampus and callosal gyrus area. Dilation of capillaries and small vessels was lessened obviously. The expression of Bcl-2mRNA and P53mRNA in hippocampus after 16Hz, 90dB infrasound treatment.

次声作用后Bcl-2mRNA和P53mRNA在海马的表达，16Hz、130dB次声作用1d组：两者在海马〓区和齿状回轻度表达，海马内血管轻度扩张；7d组：两者表达在上述区域较1d增多，微血管和小血管扩张较显，血管内皮细胞内可见呈强阳性表达的Bcl-2mRNA和P53mRNA；14d组：海马锥体细胞和齿状回颗粒细胞内Bcl-2mRNA和P53mRNA阳性表达明显增多，呈深兰色，在部分血管内皮细胞内两者强阳性表达，微小血管扩张状态较7d减轻；21d组：锥体细胞胞浆内Bcl-2mRNA和P53mRNA表达减弱；28d组：上述表达及分布与21d组相比无明显改变，海马周围颞叶皮层和扣带回区域亦可见大量散在分布的Bcl-2mRNA和P53mRNA表达，血管扩张状态已明显减轻。90dB次声作用1d-7d后，较对照组无明显变化，14d-21d后轻度表达，28d后，Bcl-2mRNA和P53mRNA表达较强。

Both upper and lower dental study models were collected from 30 boys (12 years old) and 30 girls (12 years old) with acceptable normal occlusion to understand the characteristics of the crown size, dental arch width and length such as (1) mesiodistal diameters of crown size from central incisor to first molar,(2) the width and length of dental arch and basal arch and (3) the morphology of dental arch form. After statistical analysis, data were compared with Japanese, Central and South American Indians and North American Caucasians from papers. The results were:(1) There was no statistical difference in teeth size between males and females, except the upper first molar of males was larger than that of females, lower central incisor of males was smaller than that of females.(2) The dimensions of dental arch of males were larger than that of females in general, especially such items as width and length of basal arch.(3) The crown size of Chinese male was in generally smaller than that of four other races, especially the upper canine, lower central incisor and first molar.

为了解住在台湾的中国人其牙齿的大小，齿列弓幅径及形态，为齿科人类学上的特微，以期能对儿童牙科，齿颚矫正科之临床及齿科基础医学能有所贡献，抽取12岁学童男女各30名共60名，可接受为正常咬合之上下颚齿列模型，测量其上下颚(1)左侧正中门牙到第一大臼齿共计12颗恒牙之牙冠近远心径，(2)齿列弓宽径、长径及齿槽基底宽径、长径，(3)齿列弓之形态，以上资料经统计分析作t-test检定，并与诸学者对日本人、北美白人、中美及南美印第安人人种的研究结果作检讨得知；(1)男女性恒牙的近远心径无明显差异，但男性上颚第大臼齿比女性者大，下颚正中门牙比女性者小；(2)男性的齿列弓幅径比女性者为大，尤以齿槽基底宽径及长径最显著；(3)国人男子的牙齿近远心径比其他四人种者为小，特别是国人的上颚犬齿，下颚正中门牙及第一大臼齿最小。

Based on the local synthesis theory, tooth contact analysis and precontrol method can only ensure that spiral bevel gears have perfect contact behavior without load; the loaded contact behavior, however, is unsatisfactory.

基于局部综合理论的弧齿锥齿轮齿面接触分析和接触性能预控技术可保证弧齿锥齿轮在无载时具有较理想的接触区域和传动误差，但无法保证其加载接触性能。

Leaves subsessile or lower ones with petioles 1-2 mm; cauline blade ovate to lanceolate to lanceolate-elliptic, spatulate near base, 1-2.5 × 0.5-1 cm, subglabrous with faintly strigillose margin and midvein, base cuneate to broadly so, margin denticulate with 3-9 teeth per side, apex acute to obtuse.

叶近无柄或下部的具叶柄1-2毫米；茎生叶卵形的到披针形到披针形椭圆，匙形的近基部， 1-2.5 * 0.5-1 厘米，近无毛微弱具短糙伏毛的具边缘和中脉，基部楔形到宽如此，边缘具小齿具齿每边3-9，先端锐尖到钝。

Petiole 8-20 cm, glabrous; leaf blade 5-7-foliolate; leaflets sessile, abaxially green, oblanceolate, 10-25 × 5-12 cm, abaxially glabrous or with sparse whitish hairs, ferruginous tomentose at base and in axils of lateral veins, base cuneate, margin crenate-serrate with teeth crenulate-serrulate, apex acuminate to subcaudate; lateral veins in 18-25 pairs.

叶柄8-20厘米，无毛；叶片5-7具小叶；小叶无柄，背面绿色，倒披针形， 10-25 * 5-12 厘米，背面无毛或者有稀少带白色毛的，被锈色绒毛在基部和在侧脉腋处，基部楔形，边圆齿状锯齿具细圆齿到细锯齿的牙齿，18-25对的侧脉。

This paper describes the concaved gear tooth profile after shaving resulting from the unbalance of cutting forces due to the variation of numbers of contact points acting on the teeth flanks, during backlash-free meshing engagement between the shaving cutter and the gear workpiece.

本文认为剃齿齿轮产生齿形中凹现象的主要原因是由于剃齿刀和齿轮在无侧隙紧密啮合过程中，因两侧齿面接触点数量的变化引起切削力的不平衡而造成的。

TTPF has been 100 varieties of production to be used synchronizer ring, the cone, pulley of air-condition, ring gear of planetary train etc ...It has achieved net or near forming, and it is preferred production to replace general forging.

TTPF 生产的精密锻件达 100 个品种规格，广泛用于汽车同步器齿套、齿锥、空调皮带轮、行星排齿圈等环形盘类锻件，达到了少无车削加工，是替代普通锻件的首选产品。

Living with flocks of lightweight cranes along the riverbed and fields, I would stand tall to look them in the eye, gaze at their lilting layers of pale feathers to discern what lies beneath, beneath, and slowly back away so they wouldn't strike me with steel-strong legs for invading their unmarked territory; make a bid for their tough endurance of sixty million years, so as to acquire it as my own, and pass it through these genes of words, these airborne poems, then raise my broad and scalloped wings, and dream their dreams.

同轻盈的鹤群在一起沿着河床及田野，我将挺立深深看进它们的眼里去，凝视它们蓬松层层叠叠的苍白羽毛去辨识它们的底下更深的底下有些什么然后缓缓后退这样它们不会攻击我以它们钢壮的腿因我侵犯了它们无标识的领域，设法取得它们六千万年的坚韧耐力据为己有，通过这语言的基因，这些凌空的诗句留传下来，并举起我宽阔圆齿的翅膀，梦它们的梦。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐