两尖的

Meshing properties and application of major conical surface double envelope Hourglass worm gearing;2. In this paper, the regularities of undercutting and topping of major conical surface envelope hourglass worm is researched.

分析了大锥面包络环面蜗杆的齿顶变尖和根切规律，并通过和平面包络环面蜗杆的比较，得出其在根切和齿顶变尖这两个方面具有比平面包络蜗杆更优良的性能，因而是一种在实际中可替代平面包络、具有广泛应用前景的新型包络蜗杆传动。

Half-round fender to be fitted to the shell plating from forward shoulders to the aft shoulders at upper deck level and 1.50 m below upper deck. In addition, half-round fender to be fitted in way of forecastle and poop at two levels to secure that no mooring rope touch the shell. The fender to be of pipe 150 mm x 15 mm with flat bar inside. Fenders to be well supported from backside.

在船壳板的上甲板和上甲板以下 1.50m 位置处，分别安装有从艏尖突至艉尖突的半圆形护舷木，同时在艏楼和艉楼的两个位置上应安装有半圆形护舷木以确保系泊缆绳不与船壳板接触，并直径为 150mm×15mm 钢管的护舷木内部带有扁钢，以便对护舷木从背部进行很好地支撑。

As soon as the two of them emerged from the dense forest, they saw two iron-gray horse-like animals with long pointed ears, tied to a tree.

两人刚走出密林，就见到两只似马非马，耳朵尖长，色作铁灰的动物，系立在一棵树下。

The result suggests that there be no correlation between the expression of cyc07 and enhanced elongation of rice seminal root under upland condition.

本研究克隆了细胞分裂S期特异基因cyc07，将其定位在第1染色体，同时对其在淹水与旱种条件下水稻根尖中的表达进行了分析，发现cyc07在两种培养条件下的根尖中的表达没有差异，cyc07可能与旱种条件下水稻种子根的伸长无关。

The aerodynamic characteristics of the cuted tip rhombus wing and double-delta wing of middling sweepback angle and aspect ratio about sixty type are investigated by a numerical method based on Eular equations.

采用Euler数值计算方法，对60多种中等后掠角及展弦比的切尖菱形机翼、双三角机翼纵向气动力特性进行了计算、分析和比较，从中筛选出16种切尖菱形机翼、14种双三角机翼进行了全机高速风洞实验研究，给出了机翼的展弦比、前缘后掠角、根梢比及几何扭转变化对全机升力、阻力及俯仰力矩的影响曲线和数据分析，在此基础上提出了用于定量估算两类机翼纵向气动力特性的关系式及修正因子。

Impacts of transgenic rice lines on biological characteristics of Microvrlia horvathi Nymphal duration of Microvrlia horvathi fed with young instar of BPH nymphs feeding on Bt rice after hatching was not significantly different from that feeding on Xiushui 11 control.

七、转基因抗虫水稻对尖钩宽黾蝽生物学特性的影响饲喂转基因水稻或对照品种上饲养的褐飞虱，两种转基因水稻处理组的尖钩宽黾蝽各龄若虫历期和整个若虫期与它们各自的对照都无明显差异。

The ultramafic rocks outcropped at the Altyn region are all harzburgites. Remant grains of primary minerals have melted residual texture and elastic deformation texture under high temperature and pressure. The whole-rock analyses show their low TiO〓 contents (0.01～0.04%), low Al, Ca and high MgO contents and wide Mg〓 range (89.35～95.57). Rare earth patterns have two types, namely tabacco pipe-shped and LREE-shaped, of which the former is often seen. The chondrite-nomalized Yb values of these analyses are all lower than 1. The spinels have low Ti and high Cr content and most spinels have Cr# higher than 60. All of the above characteristics show that the ultramafic rocks in the Altyn fault zone are components of metmorphic peridotites of ophiolite from depleted mantle source and most ophiolites from this zone belong to supra-subduction zone type ophiolite with a few mid-ocean ridge basalt type.

阿尔金露头区的超基性岩全为方辉橄榄岩，残余的新鲜矿物颗粒发育有熔融残余结构和高温高压下塑性变形结构，全岩分析显示样品TiO〓的含量低，为0.01～0.04％，具有低的Al和Ca，MgO含量高，Mg〓为89.35～95.57；稀土配分型式有两种，即烟斗型和LREE亏损型，前者占绝大多数，Yb球粒陨石标准化后的值全都小于1；尖晶石低Ti高Cr，大部分尖晶石的Cr〓大于60，上述特征说明阿尔金超基性岩是蛇绿岩的地幔橄榄岩成员，来自亏损的地幔源区，阿尔金蛇绿岩大多属于俯冲带之上型蛇绿岩，有少量的大洋中脊型蛇绿岩。

The results showed that the densities of NPY and CGRP-IR nerve fibers in atrioventricular valves of SHR were equal to that of the normal control Wistar-Kyotorats ,but the value of R of NPY-IR nerves,i.e.the ratio of the number of chordae tendineaes in wh...

但SHR二尖瓣及三尖瓣含NPY神经的R值，即心壁和乳头肌两个来源的含肽神经相延续所在的腱索数目与本片瓣膜上的总腱索数的比值，大于WKY大鼠；而SHR心瓣膜含CGRP神经的R值和WKY大鼠无差异。本文对SHR心瓣膜上含NPY和含CGRP神经的变化作了讨论。

IM: To investigate the effects of occlusal surface anatomy on stress distribution around apex in mandible.

目的：探明正常牙合与重度磨耗牙合两种不同牙合型时各牙根尖应力分布的特征，以期揭示牙的解剖形态及牙尖高度的改变对咬合力传导的影响规律。

objective to evaluate clinical effect of the handling protaper nickel-titanium rotary instruments in preparation of canals of posterior teeth.methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling protaper rotary instruments using step-down technique,and by k files using step-back technique for control.all teeth were obturated with lateral condensation methods.the efficiency of preparation was analyzed with ra-diographs before and after operation.results no transportation,apical blockage and ledge were found in test.the technique could keep canals smooth.there were two ledge,one instrument fracture and nine transportation in control.the operative time was shorter and post treatment pain seldom occurred in handling protaper group.conclusion the handling protaper niti rotary instruments can prepare the canals effectively and safety.after the preparation,the canals could be easily washed,sterilized and filled.it is an efficient instrumentation method for posterior teeth's canals and be used widely.

目的 评价手用protaper预备后牙根管的临床效果。方法选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用protaper多锥度镍钛旋转器械逐步伸入法预备根管，对照组用k锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗前后的x线片，评价后牙根管预备效果。结果试验组无根管偏移、根尖阻塞、台阶，且根管壁平滑流畅，无器械折断等并发症发生。对照组有2例台阶形成，器械折断1例，根管偏移9例。试验组操作时间短且术后疼痛轻微。结论应用手用protaper预备后牙根管快速、安全，成形效果好，易于根管冲洗消毒及填充，可视为临床上预备后牙根管的有效方法。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。