真空感应炉真空机组中的前级泵，历来使用滑阀泵。
Rotary piston pumps always used as backing pumps of vacuum systems in vacuum induction ovens.
学龄前级1苏西鹅环顾四周，并希望她可以是不同的。
PreSchool-Grade 1-suzy Goose looks around and wishes she could be different.
本机组采用罗茨泵作为主泵，以旋片式真空泵作为前级泵。
The set takes Roots pump as its main pump and spinning vacuum pump as pre-stage pump.
作为前级它最少可以比美我听过的任何3000美元的前级。
As a preamp it is at least as good as any $3000 preamp I've ever heard.
可单独作低真空泵用，也可与其他高真空泵组合作前级泵用；
Used either solely as Rough Pumps, or in combination with other high vacuum pumps as Backing Pumps.
大功率开关电源一般采用三相二极管整流桥作为前级整流电路。
The switching power supply usually uses the diodes rectifier as the front converter.
它可以单独使用，也可作为增压泵、扩散泵、分子泵的前级泵使用。
It can be used alone, but also as a booster pump, the proliferation of pumps, pump-pump using the former.
它可以单独使用，也可作为增压泵、扩散泵、分子泵的前级泵使用。
It can be used alone, can also be used as booster pumps, diffusion pumps, molecular pumps pump before use.
该静止变流器前级采用推挽正激式变换器，后级采用双降压式逆变器。
The first stage is push pull forward converter, and the second stage is a dual buck inverter(DBI).
在前级泵与主泵中间串联一个电磁真空充气阀，随前级泵开关而启闭。
In between, an electromagnetic vacuum inflation valve is installed in series, which opens and closes with the switch of the pre-stage pump.
它是空气压缩机前级的专用理想设备，推广使用可获得良好的综合效益。
The filter is a good special apparatus of air Compressor front stage. It will produce the best effect.
本文设计的系统包括两部分，即前级升压、稳压部分和后级逆变并网部分。
This designed system consists of two parts, First part is the control method of the multiple boost convertor, And the second part is the control method of grid-connection invertor.
它可以单独使用，管道泵也可作为增压泵、扩散泵、分子泵的前级泵使用。
This Model Vacuum pump can be used along, or as the backing pump of the other kinds of pumps, such as booster pump, diffusion pump, molecular pump etc.
所以，它适用于作扩散泵的前级泵，而且更适用于精密仪器配套和实验室使用。
Therefore, it applies to diffusion pump for the pre-pump, but also for supporting precision instruments and laboratory use.
为了抑制谐波污染，改善电网品质，目前多在电源前级加入功率因数校正环节。
In order to restrain harmonic pollution and improve power system quality, power factor correction (PFC) circuit is applied in pre-stage of power supply.
所以，它适用于作扩散泵的前级泵，而且更适用于精密仪器配套和实验室使用。
Therefore, it applies to the proliferation of pumps for the first pump, but also applies to supporting precision instruments and laboratory use.
在涡轮分子泵的前级侧充气，能强制使碳氢化合物立刻通过涡轮分子泵流入真空室。
Turbo molecular pump in the first grade side of the inflatable, can force the hydrocarbons into the immediate adoption of turbo-molecular pump chamber.
因此选择了NE5532作为低噪声的前级放大，能够很好的抑制器件的本身噪声。
Therefore chosen as a low-noise NE5532 preamp can be a very good noise suppression device itself.
由于罗茨泵是一种无内压缩的真空泵，通常压缩比很低，故高、中真空泵需要前级泵。
As the Roots pump is a non-vacuum inside the compression, the compression ratio is usually very low, so high, medium and vacuum pumps need to pump before.
前级采用电压单环调制方式，后级采用三态滞环离散脉冲调制电流滞环跟踪控制技术。
The front stage uses the single-voltage-mode control strategy and the back stage uses the three states discrete pulse modulation hysteresis current control strategy.
系统中采用线性光偶和隔离电源，使前级放大电路和后级电路隔离，保证了系统的安全性。
The EMG preamplifier circuit and other circuits are isolated by high-linearity octocoupier and isolated power that reject the industry interference and improve the security of the system.
与一些音量控制置于输入端的电路不同，这个前级放大器的特征噪声能够随同信号一起衰减。
Any noise characteristic of the preamp circuit is attenuated along with the signal, unlike circuits where the volume control is before the input.
本文对固态线性功率放大器的研制包括：前级放大器的研制、驱动级放大器的研制、末级放大器的研制。
There are three development for the Middle Power Amplifier : the first stage power amplifier, the drive stage power amplifier and the last stage power amplifier .
实验中通过前级PIN开关控制不同的低杂波输出模式，满足了HT-7装置相应实验对低杂波的要求。
The LHW output power modes can be adjusted to meet the experimental requirements in HT-7 tokamak by controlling the PIN switches in the input power sub-system.
目前电力电子应用领域中，绝大多数的交流电动机驱动逆变器前级都采用了二极管整流器或晶闸管相控整流器。
At present, in the field of power electronics applications, most of the drive systems of AC motors use diode rectifiers and phase-control thyristor rectifiers.
采用稳幅器件有效地提高了输出能量的稳定性，放大前级的输出能量波动的均方根值从4%左右降到1%以下。
Stabilization is achieved by adopting an amplitude stabilizer. The root mean square (RMS) of energy output is lowered from about 4% to below 1%.
主电路系统由输入整流滤波电路、前级逆变电路、高频变压器、整流滤波电路、后级逆变电路和输出电抗器组成。
The main circuit is made up of input rectifier & filter circuit, first inverter circuit, high-frequency transformer, second inverter circuit, rectifier & filter circuit and output reactor.
主电路系统由输入整流滤波电路、前级逆变电路、高频变压器、整流滤波电路、后级逆变电路和输出电抗器组成。
The main circuit is made up of input rectifier & filter circuit, first inverter circuit, high-frequency transformer, second inverter circuit, rectifier & filter circuit and output reactor.
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