必需的

In order to explore solutions to the problem, so the sample students learn to socialist modernization, and further Xuexi Suobi Xu of algebraic, geometric probability and basic knowledge and a rudimentary micro-integration, and forms the basic skills; further developing of thought Nengli , computing power, spatial imagination, the ability to solve practical problems and sense of innovation, from last year, to understand the science ...

为了探索解决问题的办法，使学生在高中阶段学好从事社会主义现代化建设和进一步学习所必需的代数、几何基础知识以及概率统计和微积分的初步知识，并形成基本技能；进一步培养学生的思维能力、运算能力、空间想象能力、解决实际问题的能力和创新意识，从去年起，为了解学。。。本文共有6999字

The trend of think go without saying is understandable, but estimate any condition rationally is absolutely necessary.

想当然的倾向是可以理解的，但是，理智地估计任何情形的情况是完全必需的。

Gulch where the affecting dramatic element should have been found.

在那些西部片所必需的标志之下，是一个巨大的、空虚的沟壑，在那里，本该找到些感人的戏剧元素。

With the surface hardness is required, and in determining the purchase and business operators after properly can be broken hacksaw oral zoned, zoned when if skid No traces of high hardness, zoned shallow marks after the hardness has a higher designated a distinct traces of low hardness.

与表面硬度是必需的，在决定购买和经营者正确后可以被钢锯口头划，划打滑时，如果没有高硬度的痕迹，后划为浅标志硬度有较高的指定低硬度明显的痕迹。

ScienceDaily (May 14, 2009)— In a study led by Akiko Hata, PhD, of Tufts University School of Medicine, researchers have shown that a protein expressed in the heart, FHL2, inhibits the genes necessary for the quiescence of vascular smooth muscle cells, which line blood vessels.

科学日报（2009年5月14日）——在一项Tufts大学医学院Akiko Hata带领的研究中，研究者们发现心脏里的一种蛋白FHL2可抑制一些基因，这些基因对维持血管中成线形排列的血管平滑肌细胞处于静止期是必需的。

They are the ideal choice when high headroom and low distortion are needed, especially when reproducing the dynamic range and clarity of today's digital recordings.

他们是理想的选择空间和高时低失真是必需的，尤其是音响的动态范围和当今的数码录音清晰。

This study found that health hygiene inspectors perceived need of further training at professional ability. Systemized and continued training should be implemented to improve their ability. The JCQ is a validated instrument to identify the inspector job characteristics; therefore, further application is suggested. Public health decision makers should review the current health inspector practicing model and find an appropriate one to improve quality of work.

本研究发现卫生稽查员对未来专业能力认知是必需的，系统化及持续性的训练，可用来改善稽查员的专业能力，JCQ是一个有效评估稽查员工作特质的问卷；因此，建议未来近一步加以运用，公共卫生决策者应审慎评估卫生稽查员的训练模式，找出最佳训练模式来改善工作品质。

Folic acid is necessary for synthesis of nucleic acids and formation of the heme component of hemoglobin in red blood cells.

叶酸对核酸的合成及红血球中血红蛋白的血红素的形成来说是必需的。

Two years ago, components of the RNA silencing machinery were shown to be absolutely required for forming heterochromatin, a chromatin state that silences DNA, suggesting a new rule in biology.

两年前，有研究表明RNA沉默机器在形成异染色质——无转录活性的非活动染色质——的过程中是必需的，这也暗示出生物学中存在的新"规则"。

Based on the biochemical analysis of the two proteins in vitro, the results of yeast two-hybrid experiment and protein-interaction in both wild type cells and C48 strain, we conclude HetR can form a homodimer through the Cys48 residue. We also show that the dimerization is required for heterocyst differentiation.

基于体外两种蛋白的性质比较和酵母双杂交的结果，并结合相应蓝细菌野生型和突变株C48A中HetR蛋白性质的体内研究表明：HetR蛋白可以通过第48位半胱氨酸残基形成共价结合的同源二聚体，该同源二聚体是异型胞正常分化所必需的。

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