中凹的

Results In stage Ⅰ, 4/6 was found the traction of biconvex posterior vitreous detachment at fovea.

结果 Ⅰ期裂孔中有4/6可观察到黄斑前双凸型玻璃体后脱离对中心凹的牵拉。

The vane is a technique for river bank protection,which can alter direction of velocity and eliminate observably the centrifugally induced secondary current to reduce concaved bank scour and protrude bank sediment in river curves.

导流板是一种保护冲刷河道河床的技术。它能够改变水流的流向并能显著地减少弯道水流中的次生水流，从而解决了弯道中凹岸冲刷，凸岸淤积的问题。

In chapter two, under the assumption that the set of decision variables is convex and the objective functions are concave, it is shown that the set of noninferior solutions in valued space of the objective functions turns out to be a strictly decreasing, concave and no chinky block of surface, and it can be constructed recursively.

在第2章凸性假设下非劣解集的构造及其几何性质中，在假设决策变量集为凸集，目标函数向量是凹的情况下，证明了目标函数向量值空间中的非劣解集是一严格单调递减，无缝隙且凹的曲面块，并给出了m维目标函数向量值空间中非劣解集的一种递归构造方式。

Gravure method is in the traditional method of rotogravure seihan method.

凹印制版方法中传统的方法是照相凹版制版法。

Our main products include many important springs such as the valve diesel engine, oil-pump, oil- spigot, actiyator, booster,full springs used in the valve and camshaft of the automobile and motorcycle,every kind of general compressed ,drawing, turned , clockwork and dishing springs,every kind of cone-shaped, convex, dished and tower-shaped springs with different diameter, pitch and multilayer tubbish.

主要品种有柴油机气阀、油泵、油嘴、调速器、调压等各种重要用途弹簧：汽车、摩托车气阀、凸轮轴等全机簧；各种通用的压缩、拉伸、扭转、发条、碟形等弹簧；锥形、中凸、中凹、塔状等各种变直径、变节距异形弹簧、多层筒式弹簧等。

The present invention includes guide shaft connected to universal shaft coupling; small box and large box clearance fitted with and fixed to the guide shaft; support rod with one end connected to the notched blocks inside the small box and large box and the other end connected to the roller and the sensor; and sensor fixed onto the installing frame and compression spring set inside the large box; and all these together with the pipe constitute one umbrella-shaped structure.

本发明导向轴与万向联轴节固定联接，小箱体、大箱体与导向轴是间隙配合，并在导向轴固定；支承杆一端联接于小箱体与大箱体中的凹形块，另一端与滚轮联接；传感器固定于传感器安装架上，压缩弹簧设置于大箱体中；支承杆一端与小箱体、大箱体中凹形块联接，另一端与滚轮、传感器安装架联接，支承杆沿半径方向圆周均匀分布，与小箱体、导向轴和管道组成一个伞式结构，支承杆与大箱体、导向轴和管道组成另一个伞式结构。

In this paper an innovative method for machining sculptured surfaces is presented. By using a disc cutter with a concave end instead of traditional ball-ended or drum-shaped tools, and adjusting the cut- ted axis to swing relative to the component being machined under some special rules, the envelope formed by the trace of the tool-nose may have the same derivative up to the third order as the required theoretical surface.

本文提出了一种加工自由曲面的新方法，即采用中凹的盘形铣刀取代传统的球头或鼓形铣刀，在每一行程中让刀具轴线相对于工件按特定的规律摆动，使得在垂直于进给方向的法截面中，由刀尖轨迹形成的包络面与理论曲面的法截线具有相同的1～3阶导数，从而在保持精度不变的前提下，使实际行程次数得以大幅度的减少。

By means of using a disc cutter with a concave end instead of traditional ball-ended or flat-ended ones,and adjusting the cutter axis to move relatively to the component being machined according to some special rules,the envelop formed by the trace of the tool-nose in each pass and the required surface have the same derivatives up to the second order in the plane normal to the feeding direction.

采用二阶密切曲率法，即采用中凹的盘形铣刀取代传统的球头或鼓形铣刀，在每一行程中让刀具轴线相对于工件按特定的规律摆动，使得在垂直于进给方向的法截面中，由刀尖轨迹形成的包络面与理论曲面的法截线具有相同的1阶？

To this diecasting die cavity,by using inside notch core-pulling mechanism,cope with the core-pulling problem of inside notch parts; adopting insert block structure is favourable to the snapout of gas in the course of diecasting,which solves the problem of cast air holes and conspicuously increase the qualified rate and economic benefit of diecasting.

该模具型腔采用内凹抽芯机构，解决了内凹零件的抽芯问题；采用镶块结构，有利于压铸过程中气体的排出，解决了铸件气孔问题，显著提高了压铸件的合格率和经济效益。

By looking at the individual elements in any given backbend—such as examining the direction of movement of the shoulders,删 arms,凹 torso,凨 hips and legs—we can deconstruct the posture and aligning,凟 strengthening and opening these individual regions to more refined by identifying particular areas of interest need in our students' bodies and focusing on these areas in class,凝 I call this "progressive sequencing" and it is different from "pose/ counter pose " sequencing.

通过关注每个后弯体式中独立的元素——例如检查肩膀、手臂、躯干、髋以及两腿的运动趋势——我们能够通过分解的方式来探究体式和学习校准；通过了解学生的身体中需要深化和发掘的独立的区域，凨强化并打开这些独立的区域，凣并且能够在课堂中专注于这些区域，凡我把这个叫做&渐进序列&，凷这与&体式/反体式&序列是不同的。凯

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。