例句與用法

1. in the diagram, the output of the error amp is connected to the base of an npn transistor : when the error amp drives current into this transistor's base, it allows current to flow from collector to emitter, and that transistor in turn pulls current from the base of the pass transistor
   在這個圖里，誤差放大器的輸出端連接到了一個npn三極管的基極上：當誤差放大器輸出電流到了三極管的基極上，三極管允許電流從集電極向發(fā)射極流動，這個傳輸三極管工作時就是就是從基極吸取電流的過程。
2. push-pull current mode hfl inverter also is composed of four power switches . the simulation and experiment of a 500va experimental prototype indicates that this circuit has the advantages of less components, simple topology, the ability of four quadrant operation and high efficiency . the inverter does not need the symmetry of the components " parameters and can be applied to dc to ac conversion with single low input voltage source
   推挽雙向電流源高頻鏈逆變電路也是由四個功率管組成，500va的原理樣機的仿真和實驗研究結(jié)果表明，該電路元器件少、電路拓撲簡單、能夠四象限可靠運行、變換效率高，并不要求器件參數(shù)的完全對稱，適合于輸入電壓較低的場合。
3. particular way is : it is plan tax basis with commodity sale, the tax rate consideration that provides according to tax law gives commodity to answer the appreciation the amount of tax to be paid of the burden, deduct next goods and materials is bought outside be being used to produce commodity place cost ( wait like raw material, fuel, running stores ) before pull current understands link already the value added tax of pay, the remaining sum after deducting is an enterprise to answer ratal
   具體做法是：以商品銷售額為計稅依據(jù)，按照稅法規(guī)定的稅率計算出商品應(yīng)負擔(dān)的增值稅額，然后扣除為生產(chǎn)商品所耗用外購物資（如原材料、燃料、低值易耗品等）在以前生產(chǎn)流通環(huán)節(jié)已繳納的增值稅，扣除后的余額為企業(yè)應(yīng)納稅額。
4. from the view point of the whole topologies of current mode hfl inverters, two topologies of half-bridge and push-pull current mode hfl inverters are proposed, which are composed of four power switches . hfl inverters in discontinuous current mode ( dcm ) are extended to those in continuous current mode ( ccm )
   從完善電路拓撲和降低成本的角度出發(fā)，本文提出了兩種結(jié)構(gòu)的電流源高頻鏈逆變電路，它們分別是由四個功率管組成的半橋和推挽雙向電流源高頻鏈單級逆變電路，并將工作在電感電流斷續(xù)模式的逆變電路擴展到電感電流連續(xù)模式。