【单选题】与总价合同计价方式相比较,单价合同的特点是( )。
【单选题】在施工进度上能极大地调动承包人的积极性是( )合同。
【简答题】求图示电路 戴维南等效电路,求得的开路电压为( )V,等效电阻为( )。
【单选题】When I got the news that the ship would sink, I was _________ frightened ________ my legs couldn't move forward.
【简答题】电路如下图所示,为求得RL能获得的最大功率,求得ab二端网络的戴维南等效电路的开路电压为 V。【图片】
【单选题】I get seasick when I travel ——ship.
【单选题】When the space ship was ____, I could really feel the high gravity.
【单选题】My detective work finally led me to the ship I found Godfrey.A.whichB.thatC.whereD.when
A.
My detective work finally led me to the ship ____ I found Godfrey. A.which
【单选题】The next morning I________ myself up for lost when I was spotted by a ship.
【简答题】为了求下图a的戴维南等效电路,可以先将电路做局部等效使内部结构得到一定程度的化简,如图b所示。继而可以针对图b求其戴维南等效参数UOC和Req,如图d所示。对图b求端口开路电压UOC时,应注意端口处于开路状态,此时对网孔列KVL,可以求得UOC=____V;为求图b的输入电阻Req,可将图b内部的独立电源置零,即将电压源的位置用短路代替,如图c所示,可求得Req=_____Ω。