举一反三
- <img src="https://img0.ph.126.net/LTPtYyZOSuj4Tv2nBRpl3A==/6631780249235794581.png" />，则<img src="https://img0.ph.126.net/lPylI8SkLVM6uSWljh10jw==/6599318267936296962.png" />=?
- 298K,p(O2)=100kPa条件下,O2+4H++4e-=2H2O的电极电势为( ) 未知类型：{'options': ['φ=[img=15x20]17e0a793aa2a24b.jpg[/img]+0.0591 V pH', ' φ=[img=15x20]17e0a793aa2a24b.jpg[/img]–0.0591 V pH', ' φ=[img=15x20]17e0a793aa2a24b.jpg[/img]+0.0148 V pH', ' φ=[img=15x20]17e0a793aa2a24b.jpg[/img]–0.0148 V pH'], 'type': 102}
- 中国大学MOOC: 设https://img0.ph.126.net/mAr40Ex9dj7RKIDO0xK-3A==/3750091114817379012.png 当https://img2.ph.126.net/fcEQrMQPiWl8SVqym-DI5Q==/6619396449769939505.png已知时，检验 https://img2.ph.126.net/fMrGLSQunJoC-ofRu5GTiQ==/6632469643025454989.png https://img1.ph.126.net/7BFLKYaOvuhc7ykrRD7AaQ==/6632268432397575094.png在显著水平https://img0.ph.126.net/ohfMIFH44HORvasXTiYCqg==/6599281984052422974.png下，z检验的的拒绝域为
- 在体积V内理想气体的配分函数是（） A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/f06f3edbc1e2490db16ddf913dd8567e.png" /> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/f3bd5d2ed5784896920511b072867fb2.png" /> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/daf559fcf21a48b584a41773e83704ef.png" /> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201909/50e30867ae3f46e2b36a482a15bc0c39.png" />
- MATLAB中调用v=eye(2,1)后的结果为 A: v=[1;0] B: v=[1,0] C: v=[0;1] D: v=[1 0;0 1]
内容
- 0
某同学计算得某一体积的最佳值为3.415835 立方厘米（通过某一关系式计算得到），不确定度为0.64352立方厘米，则应将结果表述为： A: V=（3.4±0.7）[img=31x22]18033d269363681.png[/img] B: V=（3.415835±0.64352）[img=31x22]18033d269363681.png[/img] C: V=（3.415835±0.6）[img=31x22]18033d269363681.png[/img] D: V=（3.41583±0.64352）[img=31x22]18033d269363681.png[/img]
- 1
某同学计算得某一体积的最佳值为3.415835 立方厘米（通过某一关系式计算得到），不确定度为0.64352立方厘米，则应将结果表述为： A: V=（3.4±0.7）[img=31x22]180307f77e8e17c.png[/img] B: V=（3.415835±0.64352）[img=31x22]180307f77e8e17c.png[/img] C: V=（3.415835±0.6）[img=31x22]180307f77e8e17c.png[/img] D: V=（3.41583±0.64352）[img=31x22]180307f77e8e17c.png[/img]
- 2
计算下列函数的导数：[img=132x26]1802f6255a99385.png[/img] 未知类型：{'options': ['', '', '', '[img src="https://img0.ph.126.net/Xl2csUY3sm99JOUqsvIxOg==/6631968265722891855.png"]'], 'type': 102}
- 3
设在金属与n型半导体之间加一电压，且https://img0.ph.126.net/83kJQk_ActDv4bjK_Tm6Bg==/2597169610128834051.png接高电位，金属接低电位，使半导体表面层内出现耗尽状态。若表面势https://img0.ph.126.net/qGoZVfZRy06KX8A0B98VPg==/1035264964361398215.png；外加电压为https://img0.ph.126.net/cOFM3QP9PggiW0zUGU3sag==/6632255238260720466.png, 施主浓度https://img1.ph.126.net/A6x9Jr8n1bE33HsM0B5XVA==/6632382781609516609.png，则耗尽层厚度约为（ ）。
- 4
设G=<;V,E>;为无向图,[img=52x21]17e0ab1cfb60906.png[/img],若u,v连通,则( ) A: d(u,v)>;0 B: d(u,v)=0 C: d(u,v)<;0 D: d(u,v)≥0