3、下图所示三极管的工作状态为（）状态。<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; b
2、非线性系统如下图所示<img style="border-bottom-color: rgb（102, 102, 102); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（102, 102, 102); border-left-style: none; border-left-width: 0px; border-right-color: rgb（102, 102, 102); border-right-style: none; border-right-width: 0px; border-top-color: rgb（1
下面立体三面投影是否正确？<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; border-
<img style='background-color: transparent; border-bottom-color: rgb（32, 32, 32); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（32, 32, 32); border-left-style: none; border-left-width: 0px; border-right-color: rgb（32, 32, 32); border-right-style: none; border-right-width: 0px; border-top-co
26、如果<img style='border-bottom-color: rgb（0, 0, 0); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（0, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb（0, 0, 0); border-right-style: none; border-right-width: 0px; border-top-color: rgb（0, 0, 0); border-top-style
下式为电压瞬时值表达式，从该式电压初相位是30°<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentCol
对于任意随机变量<img style="backface-visibility: hidden; background-color: transparent; border-bottom-color: rgb（51, 51, 51); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（51, 51, 51); border-left-style: none; border-left-width: 0px; border-right-color: rgb（51, 51, 51); border-right-style: none; b
用示波器观测图（a）所示电路的<img style="border-bottom-color: rgb（102, 102, 102); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（102, 102, 102); border-left-style: none; border-left-width: 0px; border-right-color: rgb（102, 102, 102); border-right-style: none; border-right-width: 0px; border-top-color: rg
已知函数<img style='border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; border-top-style:
16、下图中的电阻是22kΩ。<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; border
15、下图中的电阻是33kΩ。<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; border
2、运用叠加定理求解下图中的电流。<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; bord
2、输入n，求下式的值。<img style="border-bottom-color: rgb（102, 102, 102); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（102, 102, 102); border-left-style: none; border-left-width: 0px; border-right-color: rgb（102, 102, 102); border-right-style: none; border-right-width: 0px; border-top-color: rgb（1
已知系统的开环传递函数为<img style="backface-visibility: hidden; background-color: rgb（255, 255, 255); border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none;
3、运用戴维宁定理求解下图中的电流。<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; bor
如图的传动机构中，A为主动轮，B、C、D 是从动轮，且从动轮输出的动率相等．关于这个结构，错误的结论是 。<img style="backface-visibility: hidden; border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: n
25、设随机变量（X,Y)的概率密度函数为<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor;
RLC并联电路如图所示。已知电流表A1的读数为3A，A2的读数为8A，A3的读数为4A， 求电流表A的读数。I=（)A。<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: medium; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: medium; border-right-color: currentColor; border-right-style: none; border-rig
设平面区域D 由曲线<img style="backface-visibility: hidden; background-color: transparent; border-bottom-color: rgb（51, 51, 51); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（51, 51, 51); border-left-style: none; border-left-width: 0px; border-right-color: rgb（51, 51, 51); border-right-style: none;
9、3-8线译码器74LS138的引脚5为高电平时，输出<img style="background-color: transparent; border-bottom-color: rgb（0, 0, 0); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（0, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb（0, 0, 0); border-right-style: none; border-right-width:
零件上有不用去除材料的方法获得的表面吗？<img style="border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor;
6、已知<img style='border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-width: 0px; border-top-color: currentColor; border-top-style:
一个理想采样系统，采样频率Ws=10p，采样后经低通G（jW)还原，<img style="backface-visibility: hidden; border-bottom-color: currentColor; border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: currentColor; border-left-style: none; border-left-width: 0px; border-right-color: currentColor; border-right-style: none; border-right-wi
把一根磁矩为<img style="border-bottom-color: rgb（0, 0, 0); border-bottom-style: none; border-bottom-width: 0px; border-image-outset: 0; border-image-repeat: stretch; border-image-slice: 100%; border-image-source: none; border-image-width: 1; border-left-color: rgb（0, 0, 0); border-left-style: none; border-left-width: 0px; border-right-color: rgb（0, 0, 0); border-right-style: none; border-right-width: 0px; border-top-color: rgb（0, 0, 0); border-top-styl
