电池<img src='https://img2.soutiyun.com/ask/2020-11-24/975072804638767.png' />的电池反应均可以写成2Cu⁺=Cu²⁺+Cu,则一定温度下,两电池的Δ_rG_m^θ.(),E^θ().

若要增加下列电池的电动势，可采取的办法是( ) (-)Pt，H₂(<img src='https://img2.soutiyun.com/ask/2020-03-07/952447107097904.jpg' />)|H⁺(0.1mol·L^-1)|Cu²⁺(1.0mol·L^-1)|Cu()

如下图所示，<img src='https://img2.soutiyun.com/ask/2020-01-07/94725988610853.png' />应为( )。<img src='https://img2.soutiyun.com/ask/2020-01-07/947259894250194.png' />

已知两个线性变换<img src='https://img2.soutiyun.com/ask/2020-07-24/964447450539867.png' />，求从<img src='https://img2.soutiyun.com/ask/2020-07-24/964447482729708.png' />到<img src='https://img2.soutiyun.com/ask/2020-07-24/964447490132131.png' />的线性变换。

若<img src='https://img2.soutiyun.com/latex/latex.action' />，<img src='https://img2.soutiyun.com/latex/latex.action' />，则下列式子成立的是( )

已知z=lnu，<img src='https://img2.soutiyun.com/latex/latex.action' />，则<img src='https://img2.soutiyun.com/latex/latex.action' />( )

298K时,将某可逆电池短路使其放电Imol电子的电量,此时放电的热量恰好等于该电池可逆操作时所吸收热量的40倍.试计算此电池的电动势。已知此电池电动势的温度系数<img src='https://img2.soutiyun.com/ask/2020-11-21/974838823175503.png' />

设<img src='https://img2.soutiyun.com/latex/latex.action' />则<img src='https://img2.soutiyun.com/latex/latex.action' />=( )．

男性，40岁，发现左侧颈部小包块，CT、MRI检查如图所示，请选择最可能的诊断（）<img src='https://img2.soutiyun.com/shangxueba/ask/18300001-18303000/18301269/2016072818164956119.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18300001-18303000/18301269/2016072818165646074.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18300001-18303000/18301269/2016072818170225050.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18300001-18303000/18301269/20160728181708767.jpg' />

病历摘要：脑膜瘤患者女，55岁，视力下降数月。查体：视力下降，余神经体征阴性。<img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411361155670.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411363213140.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411363770796.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411364194722.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411364682394.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/21054001-21057000/21056152/2016080411365145350.jpg' />

将函数f(x)＝x²在<img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18737342/2016071617062459326.jpg' />上展开成余弦级数，其形式为<img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18737342/2016071617063532608.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18737342/2016071617065141640.jpg' />（）<img src='https://img2.soutiyun.com/shangxueba/ask/18735001-18738000/18737342/2016071617071375522.jpg' />

某一水泵的流量为<img src='https://img2.soutiyun.com/shangxueba/ask/18726001-18729000/18727196/20150618111622761.jpg' />，漏损流量为<img src='https://img2.soutiyun.com/shangxueba/ask/18726001-18729000/18727196/2015061811163167874.jpg' />，叶轮内的流量为<img src='https://img2.soutiyun.com/shangxueba/ask/18726001-18729000/18727196/2015061811163945969.jpg' />，则其容积效率<img src='https://img2.soutiyun.com/shangxueba/ask/18726001-18729000/18727196/2015061811164812800.jpg' />为（）。

利用上颌双侧<img src='https://img2.soutiyun.com/shangxueba/ask/17559001-17562000/17561302/2015093009262249313.jpg' />垫矫正反<img src='https://img2.soutiyun.com/shangxueba/ask/17559001-17562000/17561302/2015093009262249313.jpg' />，反<img src='https://img2.soutiyun.com/shangxueba/ask/17559001-17562000/17561302/2015093009262249313.jpg' />解除后<img src='https://img2.soutiyun.com/shangxueba/ask/17559001-17562000/17561302/2015093009262249313.jpg' />垫每次应磨去多少（）

一台4极中型异步电动机，P_N=200kW，U_N=380V,定子0联接，定子额定电流I_N=385A,频率50Hz,定子铜耗<img src='https://img2.soutiyun.com/ask/2021-01-03/978560273352189.png' />=5.12kW.转子铜耗<img src='https://img2.soutiyun.com/ask/2021-01-03/978560286697952.png' />=2.85kW,铁耗<img src='https://img2.soutiyun.com/ask/2021-01-03/978560298531629.png' />=3.8kW，机械损耗<img src='https://img2.soutiyun.com/ask/2021-01-03/97856031340548.png' />=0.98kW，附加损耗<img src='https://img2.soutiyun.com/ask/2021-01-03/978560322980028.png' />=3kW，<img src='https://img2.soutiyun.com/ask/2021-01-03/978560339469971.png' />.正常运行时<img src='https://img2.soutiyun.com/ask/2021-01-03/978560353474772.png' />，起动时<img src='https://img2.soutiyun.com/ask/2021-01-03/978560375203015.png' />，由于磁路饱和与趋肤效应的影响，<img src='https://img2.soutiyun.com/ask/2021-01-03/978560441999835.png' /><img src='https://img2.soutiyun.com/ask/2021-01-03/97856039470213.png' />.试求:

下面那个图与原电池的极化曲线图最接近：（）<img src='https://img2.soutiyun.com/shangxueba/ask/18114001-18117000/18114340/2015122711324991719.jpg' />

设<img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264374908477.png' />是n维实向量,且<img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264387229182.png' />战性无关,<img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264401121976.png' /><img src='https://img2.soutiyun.com/shangxueba/ask/51291001-51294000/51293683/975264415373792.png' />是线性方程组

某种环保型高能固体蓄电池生产工艺的流程：<img src='https://img2.soutiyun.com/shangxueba/ask/18372001-18375000/18372568/2015072717031274647.png' />如果外购已组装好的半成品蓄电池，那么固体蓄电池的硬件组装环节可以省掉，这种流程优化属于（）

298K时，铜片插入盛有1×10^-8mol·L^-1CuSO₄溶液的烧杯中，锌片插入盛有1mol·L^-1ZaSO₄溶液的烧杯中，电对Cu²⁺/Cu与Zn²⁺/Zn组成铜锌原电池， 已知<img src='https://img2.soutiyun.com/ask/2021-03-25/985518975595917.png' />，求此时原电池的电动势比标准状态时的电动势()

反应Sn²⁺+2Fe²⁺=Sn⁴⁺+2Fe²⁺能自发进行，将其设计为原电池，电池符号为：（）<img src='https://img2.soutiyun.com/shangxueba/ask/18594001-18597000/18596430/2016071715591344850.jpg' />

某原电池,当有1mol电池反应发生时,其体积变化为ΔV,试证明在等温条件下,该电池可逆电动势随压力的变化遵循下列关系:<img src='https://img2.soutiyun.com/ask/2020-12-22/97751383724922.png' />

可以直接利用模型上余留牙确定<img src='https://img2.soutiyun.com/shangxueba/ask/17538001-17541000/17540854/2015082211124147883.jpg' />关系的是（）。需要用<img src='https://img2.soutiyun.com/shangxueba/ask/17538001-17541000/17540854/2015082211124147883.jpg' />堤确定正中<img src='https://img2.soutiyun.com/shangxueba/ask/17538001-17541000/17540854/2015082211124147883.jpg' />位关系及垂直距离的是（）。需要用<img src='https://img2.soutiyun.com/shangxueba/ask/17538001-17541000/17540854/2015082211124147883.jpg' />堤确定正中<img src='https://img2.soutiyun.com/shangxueba/ask/17538001-17541000/17540854/2015082211124147883.jpg' />位关系和中线的是（）。需要用蜡<img src='https://img2.soutiyun.com/shangxueba/ask/17538001-17541000/17540854/2015082211124147883.jpg' />记录确定颌位记录的是（）。

女，19岁，发现左颈部无痛性肿块2年余，可活动，CT如图所示，最可能诊断为（）<img src='https://img2.soutiyun.com/shangxueba/ask/18291001-18294000/18291851/2016072817403713681.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18291001-18294000/18291851/2016072817404619041.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18291001-18294000/18291851/2016072817405389051.jpg' /><img src='https://img2.soutiyun.com/shangxueba/ask/18291001-18294000/18291851/2016072817410029572.jpg' />

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' />

某一化学反应,在298 K和大气压力下进行,当反应进度为1 mol时,放热 40.0kJ。若使反应通过可逆电池来完成,反应进度相同,则吸热4.0kJ。(1)计算反应进度为1mol时的熵变<img src='https://img2.soutiyun.com/ask/2020-04-21/956330683369702.png' />;(2)当该反应不通过可逆电池完成时,求环境的熵变和隔离系统的总熵变,隔离系统的总熵变值说明了什么问题;(3)计算系统可能做的最大功的值。

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' />