63 图示梁EI=常数,B点竖向位移为<img src='https://img2.soutiyun.com/latex/latex.action' />,单元杆端力向量为哪一个?( )
<img src='https://img2.soutiyun.com/ask/2021-02-03/981198730930672.png' />是两个格,f:L->S是格同态,试证明j的象点集合是S的子格.
一高输入电阻的桥式放大电路如图题2.4.1所示,试写出<img src='https://img2.soutiyun.com/ask/2020-06-28/962201577362116.png' /><img src='https://img2.soutiyun.com/ask/2020-06-28/962201584103502.png' />
如图所示,一平面简谐波沿x轴正向传播,若某一时刻p<sub>1</sub>点的相位为6π,经t=T/4后,与p<sub>1</sub>点相距为λ/4的p<sub>2</sub>点的相位为______。<img src='https://img2.soutiyun.com/ask/uploadfile/6693001-6696000/a98d722d2ea2bb08f1cf29cd34ee4996.png' />
临床资料:男,29岁,采石场工人,施工时异物击中右眼4小时。超声综合描述:眼球形态、大小正常,晶状体内透声清亮,横切眼球壁6:00玻璃体内见增强回声光点(箭头所指),后方无声影,其旁可见点、小片状低回声,可随眼球运动而移动。<img src='https://img2.soutiyun.com/shangxueba/ask/18216001-18219000/18217483/2015082514450637110.png' />超声提示()。
临床资料:男,25岁,眼外伤后1周。超声综合描述:左眼球形态大小正常,玻璃体内球壁颞侧2:00~6:00可见弧形带状回声,向球内突起,有多点与球壁相连,但不与视盘相连,形态似花瓣状,弧形带状回声与球壁间为无回声,最大厚度3.6mm,玻璃体透声不清亮。<img src='https://img2.soutiyun.com/shangxueba/ask/18222001-18225000/18223918/2015082514454782486.png' />超声提示()。
图中电位UB=4.4V。()<img src='https://img2.soutiyun.com/1/2021-01-13/97939639450219.png' />此题为判断题(对,错)。
点M<sub>1</sub>(3,-1,2)到直线L:<img src='https://img2.soutiyun.com/shangxueba/ask/18723001-18726000/18723265/2016071514244173938.jpg' />的距离为()<img src='https://img2.soutiyun.com/shangxueba/ask/18723001-18726000/18723265/201607151425353100.jpg' />
一平行板电容器始终与端电压一定的电源相连。当电容器两极板间为真空时,电场强度为E0,电位移为D0;而当两极板间充满相对介电常数为<img src='https://img2.soutiyun.com/ask/2020-05-09/957866119785782.png' />的各向同性均匀电介质时,电场强度为E.电位移为D.则()
下图中abcd四点间存在热力环流,根据四点气压数值判断下列说法正确的是()<img src='https://img2.soutiyun.com/shangxueba/ask/18408001-18411000/18408831/2015121609582944113.jpg' />
右图中如A点和C点电位分别为+24V和0V,则B点电位为_______。<img src='https://img2.soutiyun.com//1/2021-06-18/992897200285074.jpg' />
计算在1mol/LH<sub>2</sub>SO<sub>4</sub>介质中用KMnO<sub>4</sub>溶液滴定Fe<sup>2+</sup>溶液的K'等于多少?计量点时溶液中<img src='https://img2.soutiyun.com/ask/2020-11-16/974370804191439.jpg' />
在图1中,点A在点B的()。<img src='https://img2.soutiyun.com/1/2020-12-30/978177509790702.png' />
BaSO<sub>4</sub>的溶度积常数<img src='https://img2.soutiyun.com/ask/2020-07-28/964794357442821.png' />,向BaSO<sub>4</sub>溶液中()
在强度曲线图上,若吃水d的垂直线和<img src='https://img2.soutiyun.com/shangxueba/ask/18297001-18300000/18297034/2015011215080044267.jpg' />的交点处于点划线的下方,说明船舶处于()状态。
如图所示伸臂梁,A点支座固定,B点处支座由B点水平平移至C点,则以下描述中正确的是()。<img src='https://img2.soutiyun.com/shangxueba/ask/18705001-18708000/18706614/2014082617072884518.png' />
某岩石的点荷载试验强度<img src='https://img2.soutiyun.com/shangxueba/ask/19065001-19068000/19066771/2015102915571244158.png' />为1.87MPa,该岩石坚硬程度应为()。
岩芯直径为50mm,长度为60mm进行轴向点荷载试验,破坏荷载为8600N,修正指数为0.8,岩石点荷载强度<img src='https://img2.soutiyun.com/shangxueba/ask/19080001-19083000/19081656/2015102916351544078.png' />为()。
点(1,2,1)到平面<img src='https://img2.soutiyun.com/shangxueba/ask/19032001-19035000/19032905/2015110115113928560.png' />+2<img src='https://img2.soutiyun.com/shangxueba/ask/19032001-19035000/19032905/2015110115114815657.png' />+2<img src='https://img2.soutiyun.com/shangxueba/ask/19032001-19035000/19032905/2015110115115812967.png' />-10=0的距离为()。
在图3中,点A与点B是()重影点<img src='https://img2.soutiyun.com//1/2021-05-27/99097041394052.png' />
<img src='https://img2.soutiyun.com/shangxueba/ask/2022-04/20/994/20220420160518353.png' />(),其中L为由点(1,1,1)到点(1,3,4)的直线段。
图示桁架B点竖向位移(向下为正)△<img src='https://img2.soutiyun.com/shangxueba/ask/17727001-17730000/17727028/2015102815202050082.jpg' />为:()<img src='https://img2.soutiyun.com/shangxueba/ask/17727001-17730000/17727028/2015102815201840985.jpg' />
如图所示某机电系统机械特性曲线,其中稳定运行点是()。<img src='https://img2.soutiyun.com/shangxueba/ask/2021-11/18/1021/20211118115753373.png' />
男,4个月,相貌怪异,结合图像,最可能的诊断()<img src='https://img2.soutiyun.com/shangxueba/ask/17796001-17799000/17798971/201511231032013640.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/17796001-17799000/17798971/2015112310320224881.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/17796001-17799000/17798971/201511231032042853.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/17796001-17799000/17798971/2015112310320644602.jpg' />