有效中心

The paper chooses twenty-five key meadow sample plots in the Loess Plateau, then discusses the estimation model and estimation method of vegetation coverage by the pictures taken by the digital camera, and puts forward the effective solution for edge distortion problem caused by the central projection and vegetation information recognition problem.

该文选择黄土高原退耕还林还草区野外测量的25个典型样方，探讨了数码照相法估算植被盖度的模型和方法，提出了中心投影引起的边缘畸变问题和植被信息识别问题的有效解决方案。

This paper reveals the relationship between the parity of derivative function and the symmetry of the graph function, finding a effective way to judge whether the functional graph can have the axial symmetry or central symmetry.

揭示了函数导数的奇偶性与函数图像对称性的关系，发现了一种可以用来判定函数图像是否具有轴对称性或中心对称性的有效方法。

A relatively simple, but very effective, technique is the use of a centroid algorithm to identify the central fringe.

一个简单的但是非常有效的方法，是使用形心算法来鉴别中心条纹。

U.S. National Institutes of Health, Food and Drug Administration, Center for Disease Control and Prevention and the U.S. Agency for International Development to form a special team of the scientific study of the condoms hepatitis B, AIDS, gonorrhea, chlamydia, syphilis, chancroid, lymphogranuloma venereal disease, genital herpes and condyloma and other 9 kinds of sexually transmitted diseases, the protective effect and found that the current widespread use of condoms is not safe and effective to prevent any the spread of a venereal disease!

美国国立卫生研究院、食品和药品监督管理局、疾病预防和控制中心以及美国国际开发署共同组成的科学特别小组，研究了避孕套对乙肝、艾滋病、淋病、衣原体、梅毒、软下疳、性病淋巴肉芽肿、生殖器疱疹和尖锐湿疣等9种性传播疾病的保护效果，发现目前广泛使用的避孕套不能安全有效的防止任何一种性病传播！

U.S. National Institutes of Health, Disease Prevention and Control Center, composed of special scientific group to study the condoms for AIDS, gonorrhea, chlamydia, syphilis and chancroid, lymphogranuloma sexually transmitted diseases, such as genital herpes and condyloma 9 Sexually transmitted diseases to protect the effectiveness of the current found that the widespread use of condoms can not be completely effective to prevent any spread of sexually transmitted diseases!

美国国立卫生研究院、疾病预防和控制中心组成的科学特别小组，研究了避孕套对艾滋病、淋病、衣原体、梅毒、软下疳、性病淋巴肉芽肿、生殖器疱疹和尖锐湿疣等9种性传播疾病的保护效果，发现目前广泛使用的避孕套不能彻底有效的防止任何一种性病传播！究其原因，避孕套不安全主要有三点

The results indicated that chromosome counting was the most reliable and precise method, however, it was cumbersome and required skilled cytological techniques; The chromocenter size, heterochromatin number, chroloplast number of guard cell and certain plant morphological characteristics are simple and practical methods for ploidydetermination but with some shortages.

结果表明：对体细胞染色体的直接计数法是最可靠的方法，但费时、难度大；叶片气孔大小与倍性无显著相关性；保卫细胞叶绿体数目、体细胞染色中心大小以及异染色质个数与黄瓜倍性密切相关，是简单、快速而有效的倍性鉴定方法；植株的形态学观察也能间接确定植株倍性，但鉴定时期偏晚，精确性较差。

It is also an effective means of circulating energy, and activating energy centers.

它也是能量流通、激活能量中心的一种有效方法。

This year in Feburary, small drop corporation was closure operation center freely to be installed in the round include a country 863 plans project, can be on guard effectively the small drop of sealed virus and new virus is active defence software.

今年2月，微点公司免费为开闭幕式运营中心全面安装了列入国家863计划项目、能够有效防范未知病毒和新病毒的微点主动防御软件。

Interacting system of concentrically braced and moment resisting frames is one of the commonly used dual systems resisting lateral forces. It is widely used in tall buildings as an effective and economic seismic structure system.

框架-中心支撑体系是常用的双重抗侧力体系之一，目前作为一种经济、有效的抗震结构形式已被广泛应用于高层建筑结构中。

Mr. Xu of referral center of psychology of school of cent of prosperous of great connecting with the boxing skill also expresses Hua Ke, with classmate teacher confabulate sometimes more effectively help undergraduate solves psychological problem, had the difficulty that is hard to handle quite when the student especially when, the guidance with teacher correct major more it is important to show.

华科大武昌分校心理咨询中心的徐老师也表示，和同学老师谈心有时更能有效地帮助大学生解决心理问题，非凡是当学生有了比较难于处理的困难时，老师专业正确的指导更显重要。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。