【判断题】实验法分为市场实验法和实验室实验法,后者更精确,所以应用范围也更广泛
【单选题】麦克斯韦关于电磁场理论的基本假设是( )。
C.
变化的磁场产生涡旋电场,变化的电场产生变化磁场
D.
相对于观察者静止的电荷产生电场,恒定电流产生稳恒定磁场
【单选题】If you want to buy some books, you can go to the ______________. [ ]
【单选题】mso-bidi-font-family:"Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">麦克斯韦关于电磁场理论的基本假设是( 宋体;mso-font-kerning:1.0pt;mso-ansi-languag...
A.
mso-bidi-font-family:"Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">相对于观察者静止的电荷产生电场
B.
mso-bidi-font-family:"Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">恒定电流产生磁场,变化的磁场产生涡旋电场
C.
mso-bidi-font-family:"Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">变化的磁场产生涡旋电场,变化的电场产生变化磁场
D.
mso-bidi-font-family:"Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language: EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">相对于观察者静止的电荷产生电场,恒定电流产生稳恒定磁场
【单选题】Go straight along this street and , you can see the post office. [ ]
【单选题】The boy with a book in his hand __ to see you since nine o’clock this morning.Can you see him now?
【单选题】以下说法错误的是
A.
(A)动生电动势是有洛仑兹力引起,这与洛仑兹力对电荷不作功不矛盾;
B.
(B)涡旋电场不是保守力场,因而没有电势的概念;
C.
(C)变化的磁场产生的电场和变化的电场产生的磁场一定随时间变化;
D.
(D)尽管麦克斯韦引进了位移电流的概念,但原有的电荷守恒定律仍然成立。
【简答题】恒定电流产生的稳恒磁场是____的矢量场,____是它的旋涡源。