<img src="http://p.ananas.chaoxing.com/star3/origin/56eb9e77712e5503e3e1f98a.png" title="4.2.3 1.png"/>
框中所示为何细胞?(15.0分)<img src="http://p.ananas.chaoxing.com/star3/origin/b80ad37026386598abd046429121193c.jpg" title="01.jpg"/>
产生如图所示镦粗裂纹的原因是什么?( )<img src="http://p.ananas.chaoxing.com/star3/origin/5720a0b2e4b0809f2410ba01.png" title="3.png"/>
detA=1/3,=()<img src="http://p.ananas.chaoxing.com/star3/origin/7a55ad796ad415e38727650a50e4b565.png"/>
的秩为3。()<img src="http://p.ananas.chaoxing.com/star3/origin/b1fee5a4b155ec4966ee186947fc72da.png"/>
系数矩阵有3个不同的特征值。()<img src="http://p.ananas.chaoxing.com/star3/origin/275e6f27f121cbe7f6ff2b333626830b.png"/>
幂级数在区间(2,3)上收敛。()<img src="http://p.ananas.chaoxing.com/star3/origin/db9bd75eb63772d017847c0c93df5b9c.png"/>
detA=1/3,=() <img src='\"http://p.ananas.chaoxing.com/star3/origin/7a55ad796ad415e38727650a50e4b565.png\"/'/>
这段3/4拍的旋律没有弱起。 <img src='\"http://p.ananas.chaoxing.com/star3/origin/955912c6ebb36206f8517d00b3fb98f6.png\"/'/>
求下列等式:设<img src='https://img2.soutiyun.com/ask/2020-11-11/973957900743664.png' />
设<img src='https://img2.soutiyun.com/ask/2020-12-15/976910006079741.png' />为同一区间上的可导函数,证明
图示结构两个状态中的反力互等定理r12=r21,r12和r21的量纲为:<img src='https://img2.soutiyun.com/ask/uploadfile/12180001-12183000/c4a35ffd1ef3a016c78f300157b69854.png' />
设p>1,证明不等式<img src='https://img2.soutiyun.com/ask/2021-01-18/979838709003026.png' />
用戴维南定理求图中7Ω电阻中的电流I为()。<img src='https://img2.soutiyun.com/shangxueba/ask/1887001-1890000/1889144/ct_jgzjgysm_jgzjgyschoose_00465(20093)1.jpg' />
患者男性,42岁,体检。心电图如图3-15-1所示,应诊断为()。<img src='https://img2.soutiyun.com/shangxueba/ask/18231001-18234000/18232143/2015082611171830655.jpg' />
患者男性,23岁,体检。心电图如图3-15-5所示,应诊断为()。<img src='https://img2.soutiyun.com/shangxueba/ask/18231001-18234000/18232163/2015082611220090272.jpg' />
证明不等式:<img src='https://img2.soutiyun.com/shangxueba/ask/51399001-51402000/51401966/977847325438542.png' />.
设f(x)为连续函数,且满足等式<img src='https://img2.soutiyun.com/shangxueba/ask/51381001-51384000/51383367/97672305236883.png' />则<img src='https://img2.soutiyun.com/shangxueba/ask/51381001-51384000/51383367/976723063701479.png' />=().
利用公式和定理证明下列等式:
证明本节定理3中的(2).定理3(2)如果limf(x)=A,limg(x)=B,那么
若<img src='https://img2.soutiyun.com/latex/latex.action' />,<img src='https://img2.soutiyun.com/latex/latex.action' />试证明时域卷积定理<img src='https://img2.soutiyun.com/latex/latex.action' />和频域卷积定理<img src='https://img2.soutiyun.com/latex/latex.action' />
证明不等式:<img src='https://img2.soutiyun.com/ask/2020-08-18/966606791867552.png' />
证明恒等式:<img src='https://img2.soutiyun.com/ask/2020-08-10/965923265077714.png' />
简易起重设备的计算简图如图所示。已知斜杆AB用两根63mm×40mm×4mm不等边角钢组成。试问在提升重量为FP=15kN的重物时,斜杆AB横截面上的正应力为()。<img src='http://static.jiandati.com/d0c8379-chaoxing2016-565874.png' />