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And many scientists argued against drinking water fluoridation from that time, causing this study in China stopped.

饮水适量加氟的社会、经济效益已为各国大量的研究所证实，因此此项公共卫生措施在国际上已被各个国家广为接受。

In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

详细分析了反激式变换器的两种工作状态，连续模式(Continuous Conduct Mode ，简称CCM)和断续模式(Discontinuous Conduct Mode，简称DCM)以及各自的特点、应用场合，论证了两种工作状态的临界模式，从电路参数的角度明确了二者的界限，同时还介绍了DCM模式下PFC的基本原理，为后面的设计奠定理论基础；通过对整个变换器系统建立准确的数学模型，对此变换器的电路结构做了进一步的研究，定性、定量地分析了变换器各部分的工作状态，为仿真和实验参数的确定以及电路参数的优化提供理论依据；从稳态分析的角度，为系统建立了动态小信号状态方程并推导出系统的传递函数，利用matlab对系统进行仿真，进而根据仿真结果以及PFC的相关理论对系统进行校正，采用在电压环加入零点—极点补偿器的设计方案，得到了满意的系统特性并且保证了PFC的顺利实现；最后，在前面所做工作的基础上，结合设计要求计算出此变换器系统中每个元器件的数值，利用Pspice对其进行了仿真、优化，然后根据仿真结果搭建了硬件电路。

When a lineswoman called Williams for a foot fault to set up match point for Clijsters, Williams argued and berated the judge with profanity.

比赛中，小威被司线判定二发脚误，导致对手克里斯特尔斯得到赛点。

The joint owners of the car argued whether the footbrake or the handbrake should be applied.

合资的车主们还在争论着应该用脚刹车还是用手刹车。

He ran into someone on the footpath, and still argued that the people had not made way for him.

他在人行道上骑车撞了人，还强词夺理说人家没给他让路。

It can be argued that moment and foresightedness are the essence of Intelligence that man's ability to manipulate both past and future as guides to present action ,is what makes him human .

可以说，目前和前瞻性的本质情报；那个男人的能力，操纵过去和今后的行动指南，目前，是什么使他的人权。

It can be argued that momeny and foresightedness are the essence of intelligence;that man's ability to manupulate time,to employ both past and future as guides to present action,is what makes him human.

可以证实的是，记忆力和预见能力是智力的重要部分，人类之所以是人类就在于他具有驾驭时间的能力，他能用过去和将来指导当前的行为。

It can be argued that momeny and foresightedness are the essence of intelligence;that mans ability to manupulate time,to employ both past and future as guides to present action,is what makes him human.

可以证明的是，记忆力和预见能力是智力的重要部分，人类之所以是人类就在于他具有驾驭时间的能力，他能用过去和将来指导当前的行为。

It can be argued that momeny foresightedness are the essence of intelligence that man s ability to manupulate time to employ both past future as guides to present action is what makes him human .

可以证明的是，记忆力和预见能力是智力的重要部分，人类之所以是人类就在于他具有驾驭时间的能力，他能用过去和将来指导当前的行为。

It can be argued that momeny and foresightedness are theessence of intelligence;that man's ability to manupulate time,to employboth past and future as guides to present action,is what makes himhuman.

可以证明的是，记忆力和预见能力是智力的重要部分，人类之所以是人类就在于他具有驾驭时间的能力，他能用过去和将来指导当前的行为。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。