四个

In the design of the power supply, the main circuit topology frame uses full-bridge series resonant switching and parallel load connection, in which, four MOSFETs are adopted as the power switches, and by four pulses which UC3879 produces, high frequency operation and fast response are realized. In addition, the MOSFET in the switching power supply has no hard turn-on or turn-off situation in transition, thus the disturbance to the power system is avoided. Especially,by the use of high frequency transformer, PQ50/50, the switching power system can provide the steady discharge current without any amperite.

此开关电源采用全桥软开关技术、串联谐振并联输出，四个MOSFET管为主控制开关元件，通过脉冲产生电路UC3879产生的四路相关脉冲实现了高频交替开关，同时能快速响应输出的各种变化；避免了开关管的硬开关，提高了转换效率，另外通过采用高频变压器PQ50/50隔离了原副边，减小了高次谐波对电网干扰；无需镇流电阻也可实现气体稳定放电。

One of the four spirits who preside over the four parts of the universe.

其中的四种精神的人来主持四个部分的宇宙。

Therefore, it might be said that our position as to the etiology of primary glaucoma, as I conceive it, is that at least four element s may figure in it, two of which are problematical and largely hypothetical, and two of which are certain.

因此，可以这样说：关于原发性青光眼的病因，据我看来，至少有四个因素：其中有两个因素是有问题的和多半是假设的，但另两个因素是肯定的。

Therefore , it might be said that our position as to the etiology of primary glaucoma ,as Iconceive it , is that at least four element s mayfigure in it , two of which are problematical andlargely hypothetical , and two of which are certain.

因此，可以这样说：关于原发性青光眼的病因，据我看来，至少有四个因素：其中有两个因素是有问题的和多半是假设的，但另两个因素是肯定的。

In fact, 9 years Qian Xinhua introduced exterior 4 tall canals, altogether of company of eye pronucleus center 6 tall canals, among them two familial personages that are Chen Fashu.

事实上，9年前新华都就引入了外部四个高管，现在核心子公司一共六个高管，其中两个是陈发树的家族人士。

A quadrilateral has four equal margins and four right angle.

正方形有四条等边和四个直角。

The construction of numeral abbreviation can be roughly grouped into four types: subordination, coordination, subject+predicate and verb+object. Among them, subordination occupies the main part. Numeral abbreviation can be derived from either extracting the first, the middle or the last morpheme from its original words or generalizing them. Numeral abbreviation consists of four classes: word, phrase, sentence and text in terms of its original words. Most numeral abbreviations are disyllabic and quadrisyllable, and only a small number of them are trisyllabic and polysyllabic.

数字缩略语的结构有类化的特点，包括偏正式、并列式、主谓式、动宾式等，其中以偏正式为主；在抽取方式上，数字缩略语有抽头式、取中式、取尾式和统括式；从缩略的对象上看，数字缩略语的缩略可分为词、短语、句子和篇章四个层次；在音节分布上，数字缩略语以二、四音节为主，三音节和多音节为辅。

There are four equal lines and quadruple right angles in the square.

正方形有四条等边和四个直角。

Towards partial critical item processing method and some important frock,studying、 probing time after time,i did technical schedule, established design of special fixture for finish turning one, finish turning two drill and milling lobe four critical item quadruplet process.

对于零件的关键工序加工方法及一些重要的工装，经过多次研究，探索，最终完成了工艺规程制定和精车一、精车二、钻孔及铣叶型四个关键工序四套工序的专用夹具设计。

It is well reported that human telomeric DNA sequence [AGGG3] can form a well-defined quadruplex structure with the hydrogen bond between guanine bases in the appearance of K+ and Na+. It was reported that the formation and stability of the structure is meaningful for both gene regulation and apoptosis.

据文献报道，人类染色体端粒中的重复序列[AGGG3]可以在钠、钾离子存在的条件下通过四个G碱基间形成平面环状氢键从而折叠成四链结构G-quadruplex，此结构的形成与稳定对基因调控以及细胞的凋亡有着重要意义。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。