【多选题】【听力B】Fill out the space after the record. The answers are bellow , select the best one and fill out the spaces with only letter from A to L.(听录音完成填空,选择合适的单词,填写A-L字母;注意填写答案时,答案前后一定不要留空格或符号,系统自动阅卷,可能会检...
A.
complete
B.
procedure
C.
arbitrary
D.
completely
E.
switched
F.
functional
G.
responses
H.
initial
I.
determine
J.
applied K. determined L. frequently We now consider those RLC circuits in which DC sources are 1 into the network and produce forced 2 that do not necessarily vanish as time becomes infinite. The general solution is obtained by the same 3 that was followed in RL and RC circuits: the forced response is 4 completely; the natural response is obtained as a suitable 5 form containing the appropriate number of 6 constants; the 7 response is written as the sum of the forced and the natural responses; and the 8 conditions are then determined and 9 to the complete response to find the values of the constants. It is this last step which is quite 10 the most troublesome to students.
【简答题】【听力A】Fill out the space after the record.(听录音完成填空;注意填写答案时,答案前后一定不要留空格或符号,系统自动阅卷,可能会检测有误。) When a drain-source voltage increases further, however, something rather surprising happens: the 1 current lev...
【多选题】Fill out the spaces after the record . The answers are bellow , select the best one and fill out the spaces with only letter from A to M. (听录音完成填空,选择合适的单词,填写A-M字母;注意填写答案时,答案前后一定不要留空格或符号,系统自动阅卷,可能会检测有误...
A.
nickel
B.
hundreds
C.
coil
D.
vacuum
E.
classified
F.
nonmagnetic
G.
pass
H.
provides
I.
field
J.
materials K. path L. vocum M.classify An inductor is basically a 1 of wire. The material around which the coil is formed is called the core. Coils are wound on either 2 or magnetic materials. Examples of nonmagnetic 3 are air, wood, copper, plastic, and glass. The permeabilities of these materials are the same as for a 4 . Examples of magnetic materials are iron, 5 , steel, cobalt, or alloys. These materials have permeabilities that are 6 or thousands of times greater than that of a vacuum and are 7 as ferromagnetic. A ferromagnetic core 8 a better 9 for the magnetic lines of force and thus permits a stronger magnetic 10 .