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In this article,the authors analyze the aiguille voltage of the whole-bridge DC source converter circuit according to the mathematics model when the MOSFET transistor is shut and the instant voltage equations are obtained.

对直流电源变换器的常用电路型式进行了具体工作过程分析；根据所建立的数学模型，分析MOS管关断瞬间的尖峰电压，得出其瞬间电压方程，并应用PSPICE软件的仿真结果对其进行验

The ailanthus plants werenot primary source host for ZYMV,WMV,PRSV-W and CMV.

首次证明臭椿在葫芦科作物病毒流行中不能作为其主要病毒ZYMV、WMV、PRSV-W和CMV的毒源寄主。

Air brick which is made of cement、clay、coal ash and coal waste has been the main architecture wall-material of development these years,with it's characters as light-quality、heat insulation and sound insulation,even more,it mades proper use of flotsams as well as saving soil-source.

空心砖是近年来发展的主要建筑墙体材料，它主要由水泥、粘土、粉煤灰、煤矸石等材料制作，质量轻，隔热隔音好，尤其种既合理利用了废料又节省土地资源。

Sometimes the air chamber above the soil sample is connected to a regulated pressure source.

有时，土壤试样上面的空气箱与调压源相连接。

The cycle performance and discharge pressure of air source heat pump were investigated by varying the outdoor temperature and indoor air intake of the condenser.

通过改变室外侧环境温度和进入冷凝器的风量研究R142b在空气源热泵机组中的循环性能和排气压力。

It also includes an extra source of cooling air for the brakes in the form of side louver openings.

它还包括一个额外的冷却空气源的刹车形式的一方百叶窗开口。

Shanghai and East China market is a major tourism source markets, the successful maiden voyage marks the Ningxia Hui Autonomous Region to Shanghai corridor opened up air travel, tourism cooperation has entered a new stage.

上海和华东市场是国内重要的旅游客源地市场，首航成功标志着上海至宁夏的空中旅游走廊打通，两地旅游合作迈入新的阶段。

In this article, we focus on the air track gas source and the choice of pore size and the level of horizontal transfer method.

在本文中，我们重点讨论了气垫导轨气源和孔径的选择以及水平调横的方法。

Air gun source could be used for exploring the regional fine structure and monitoring the temporal variation.

气枪震源可以用于区域精细结构的探测以及动态变化的监测。

According to the influence of air pollutant source parameters, weather factors, approach underlying surface layer and non-linearity reaction, the correction coefficient is to modify final simulate value, which perfectly resolves the problem of the result probability and complexity actually. Therefore, the result of the model is more reliable.(2) Long-term monitoring average concentration isoline map and simulating air pollutant concentration isoline map are drawn by drawing function of surfer 8.0 software.

本研究提出的长期平均浓度模型的预测值与实测值的相关系数r=0.813在α=0.05下通过检验，且验证的样本量大，计算结果具有代表性，为湛江市郊区环境空气质量全面预测和污染防治提供理论依据，该模型亦可进而推广应用于SO_2、NO_x、CO等大气污染物的扩散状态研究和计算。

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％。