保持

This paper studies the invariant, which is the linear preserving problem based on generalized inverse of matrices. The generalized inverse of matrices and the research status of preserving problems of generalized inverse are outlined. In the basis of deeply understanding the basic knowledge of linear maps, the definition, characteristics of generalized inverse and decomposition of matrix, the author analyzes the decomposition form of preserving idempotence and preserving tripotence in the PID, then studies on the linear maps form of preserving group inverses of symmetric matrices.

本文研究的不变量是矩阵广义逆线性算子的保持问题，概述了广义逆矩阵，广义逆保持问题的研究现状，在对线性映射的基础知识，广义逆矩阵的定义、性质和矩阵的分解深入理解的基础上，深入分析了保幂等、保立方幂等矩阵在主理想整环上的分解形式，继而研究了保对称矩阵群逆的线性算子形式。

Raise eyebrows and hold for 10 -15 seconds (watch out for synkinesis - hold the brow at a point before the corner of your mouth starts to move or your cheek tries to help).

抬起眉毛，保持10到15秒钟（小心"联带运动"－将眉毛保持在你的嘴角会被带动或者你的脸颊开始要帮忙运动之前）。

The initial attack is followed by a takedown, with the attacker generally staying in contact with the broken limb to maintain leverage on the target.

初次攻击后紧接着将对手摔倒，攻击者一般仍保持着与对手折断肢体的接触，以保持对目标的杠杆作用。

Be sure to continue interacting with the maturing companion parrot — whenever it's in the right mood — in order to maintain tameness.

务必要继续与成熟的同伴鹦鹉保持良好的互动，无论它是拥有好的情绪，还是为了保持温顺的态度。

A threading mechanism in a magnetic writing/reading apparatus wherein a leader block for taking a magnetic tape out of a tape cartridge is stabilized in motion and ensured to operate reliably even in a state of not holding the tape is to be provided.

一种磁读/写装置内的穿带机构，其中用于将磁带从磁带盒中取出的导块即使在没有保持磁带时也能使得运动平稳并保持可靠操作。

Effects: Can deep provide and long hold up water, relieve excessive skin tautness, contract large skin pores, and prevent wrinkles due to lack of water; helps to keep the skin in an active, soft, elastic state all day long.

功效：深层补充肌肤所需水分，并持久锁住水分，保持肌肤湿润状态，增强皮肤柔软度，舒缓面部肌肤紧绷现象，收缩粗大毛孔，预防肌肤干纹产生，使肌肤一整天保持活力健康、自然弹性的状态。

As described earlier, the change of pressure can lead to business card printing and membership card making effect change, and different business card printing and membership card making machine stress, tensility eqripjment, Business card printing and membership card making their skills and a degree of difference, cards and membership cards effect of making will be different.

后文还来挑功，不不张力的保持会导致制卡和会员卡制作成果的保持，而且，差别制卡和会员卡制作机的不不张力、不张力等共性差别，制卡和会员卡制作工人的技艺程度也有必定的不同，差制卡和会员卡制作成果的感化也会不不同。

Many property owners choose thatch not only for its beauty but because they know it will keep them cool in summer and warm in winter.

许多业主选择茅草屋顶不仅因为它的美丽，还因为他们知道它将让他们在夏季保持凉爽和在冬季保持温暖。

The enterprise sustainable development is that in course of the enterprise development, the enterprise not only achieve its business target and enhance the market status, but also gained the ability of success in the one-up competitive field and the to-be outstretched management condition, and make the enterprise be prosperous in long-term. And there are many theoretic about the sustainable development.

企业可持续发展，是指企业在追求自我生存和永续发展的过程中，既要考虑企业经营目标的实现和提高企业市场地位，又要保持企业在已领先的竞争领域和未来扩张的经营环境中始终保持持续的盈利增长和能力的提高，保证企业在相当长的时间内长盛不衰。

Social public: As the leading enterprise of toilet soap industry the company always keep good social reputation, for example, often participating various public-spirited activities, and keeping good relationship with every large financial organization, news media, and the relative government departments.

社会公众：作为香皂行业的领先企业，公司一直保持较好的社会声誉，经常参加各种公益活动，与各大金融机构、新闻传媒以及相关政府机构保持良好关系。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。